Insects
The class Insecta, in the phylum ARTHROPODA, whose members are characterized by division into three parts: head, thorax, and abdomen. They are the dominant group of animals on earth; several hundred thousand different kinds having been described. Three orders, HEMIPTERA; DIPTERA; and SIPHONAPTERA; are of medical interest in that they cause disease in humans and animals. (From Borror et al., An Introduction to the Study of Insects, 4th ed, p1)
Chromosomes
Chromosome Mapping
Chromosome Banding
Staining of bands, or chromosome segments, allowing the precise identification of individual chromosomes or parts of chromosomes. Applications include the determination of chromosome rearrangements in malformation syndromes and cancer, the chemistry of chromosome segments, chromosome changes during evolution, and, in conjunction with cell hybridization studies, chromosome mapping.
X Chromosome
Chromosome Aberrations
Sex Chromosomes
The homologous chromosomes that are dissimilar in the heterogametic sex. There are the X CHROMOSOME, the Y CHROMOSOME, and the W, Z chromosomes (in animals in which the female is the heterogametic sex (the silkworm moth Bombyx mori, for example)). In such cases the W chromosome is the female-determining and the male is ZZ. (From King & Stansfield, A Dictionary of Genetics, 4th ed)
Chromosomes, Human, Pair 1
Chromosomes, Human
Chromosomes, Bacterial
Chromosomes, Human, Pair 7
Chromosomes, Human, Pair 11
Chromosomes, Human, Pair 17
Chromosomes, Human, Pair 6
Chromosomes, Human, Pair 9
Chromosomes, Human, Pair 21
Chromosomes, Plant
Chromosomes, Fungal
Chromosomes, Human, 6-12 and X
Chromosomes, Human, Pair 2
Chromosomes, Human, Pair 16
Chromosomes, Human, Pair 22
Chromosomes, Mammalian
Chromosomes, Human, Pair 13
Chromosomes, Human, Pair 4
Chromosomes, Human, Pair 10
Chromosomes, Human, Y
Chromosomes, Human, Pair 8
Chromosomes, Human, Pair 19
Chromosome Disorders
Chromosomes, Artificial, Bacterial
Chromosomes, Human, X
Chromosomes, Human, 1-3
Chromosomes, Human, Pair 12
Chromosome Painting
A technique for visualizing CHROMOSOME ABERRATIONS using fluorescently labeled DNA probes which are hybridized to chromosomal DNA. Multiple fluorochromes may be attached to the probes. Upon hybridization, this produces a multicolored, or painted, effect with a unique color at each site of hybridization. This technique may also be used to identify cross-species homology by labeling probes from one species for hybridization with chromosomes from another species.
Chromosomes, Human, Pair 5
Chromosomes, Human, Pair 15
Chromosomes, Human, Pair 14
Chromosomes, Human, Pair 18
In Situ Hybridization, Fluorescence
Molecular Sequence Data
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Chromosomes, Human, 16-18
Chromosomes, Human, Pair 20
Chromosomes, Artificial, Yeast
Chromosomes in which fragments of exogenous DNA ranging in length up to several hundred kilobase pairs have been cloned into yeast through ligation to vector sequences. These artificial chromosomes are used extensively in molecular biology for the construction of comprehensive genomic libraries of higher organisms.
Chromosomes, Human, 13-15
Genetic Linkage
Chromosome Breakage
Chromosomes, Human, 21-22 and Y
Base Sequence
Genetic Markers
Chromosome Inversion
Chromosome Positioning
Chromosomes, Human, 4-5
X Chromosome Inactivation
Centromere
Meiosis
Translocation, Genetic
Hybrid Cells
Chromosomes, Human, 19-20
Amino Acid Sequence
Aneuploidy
The chromosomal constitution of cells which deviate from the normal by the addition or subtraction of CHROMOSOMES, chromosome pairs, or chromosome fragments. In a normally diploid cell (DIPLOIDY) the loss of a chromosome pair is termed nullisomy (symbol: 2N-2), the loss of a single chromosome is MONOSOMY (symbol: 2N-1), the addition of a chromosome pair is tetrasomy (symbol: 2N+2), the addition of a single chromosome is TRISOMY (symbol: 2N+1).
Mitosis
Metaphase
Recombination, Genetic
Cloning, Molecular
Mutation
Insect Hormones
Insect Control
Crosses, Genetic
Microsatellite Repeats
Larva
Phenotype
Drosophila melanogaster
Diptera
An order of the class Insecta. Wings, when present, number two and distinguish Diptera from other so-called flies, while the halteres, or reduced hindwings, separate Diptera from other insects with one pair of wings. The order includes the families Calliphoridae, Oestridae, Phoridae, SARCOPHAGIDAE, Scatophagidae, Sciaridae, SIMULIIDAE, Tabanidae, Therevidae, Trypetidae, CERATOPOGONIDAE; CHIRONOMIDAE; CULICIDAE; DROSOPHILIDAE; GLOSSINIDAE; MUSCIDAE; TEPHRITIDAE; and PSYCHODIDAE. The larval form of Diptera species are called maggots (see LARVA).
Spodoptera
Lod Score
Pedigree
Hemiptera
Sequence Analysis, DNA
Baculoviridae
Family of INSECT VIRUSES containing two subfamilies: Eubaculovirinae (occluded baculoviruses) and Nudibaculovirinae (nonoccluded baculoviruses). The Eubaculovirinae, which contain polyhedron-shaped inclusion bodies, have two genera: NUCLEOPOLYHEDROVIRUS and GRANULOVIRUS. Baculovirus vectors are used for expression of foreign genes in insects.
Insect Vectors
Alleles
Beetles
Evolution, Molecular
DNA
A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).
Nondisjunction, Genetic
Nucleic Acid Hybridization
Widely used technique which exploits the ability of complementary sequences in single-stranded DNAs or RNAs to pair with each other to form a double helix. Hybridization can take place between two complimentary DNA sequences, between a single-stranded DNA and a complementary RNA, or between two RNA sequences. The technique is used to detect and isolate specific sequences, measure homology, or define other characteristics of one or both strands. (Kendrew, Encyclopedia of Molecular Biology, 1994, p503)
Chromosomes, Artificial, Human
Kinetochores
Grasshoppers
Models, Genetic
Telomere
Species Specificity
The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.
Chromosome Walking
A technique with which an unknown region of a chromosome can be explored. It is generally used to isolate a locus of interest for which no probe is available but that is known to be linked to a gene which has been identified and cloned. A fragment containing a known gene is selected and used as a probe to identify other overlapping fragments which contain the same gene. The nucleotide sequences of these fragments can then be characterized. This process continues for the length of the chromosome.
Blotting, Southern
Polymerase Chain Reaction
In vitro method for producing large amounts of specific DNA or RNA fragments of defined length and sequence from small amounts of short oligonucleotide flanking sequences (primers). The essential steps include thermal denaturation of the double-stranded target molecules, annealing of the primers to their complementary sequences, and extension of the annealed primers by enzymatic synthesis with DNA polymerase. The reaction is efficient, specific, and extremely sensitive. Uses for the reaction include disease diagnosis, detection of difficult-to-isolate pathogens, mutation analysis, genetic testing, DNA sequencing, and analyzing evolutionary relationships.
Chromosomal Proteins, Non-Histone
Genotype
Spindle Apparatus
Chromosomal Instability
Sequence Homology, Amino Acid
Chromosome Fragility
Drosophila
Haplotypes
Multigene Family
A set of genes descended by duplication and variation from some ancestral gene. Such genes may be clustered together on the same chromosome or dispersed on different chromosomes. Examples of multigene families include those that encode the hemoglobins, immunoglobulins, histocompatibility antigens, actins, tubulins, keratins, collagens, heat shock proteins, salivary glue proteins, chorion proteins, cuticle proteins, yolk proteins, and phaseolins, as well as histones, ribosomal RNA, and transfer RNA genes. The latter three are examples of reiterated genes, where hundreds of identical genes are present in a tandem array. (King & Stanfield, A Dictionary of Genetics, 4th ed)
DNA, Satellite
Highly repetitive DNA sequences found in HETEROCHROMATIN, mainly near centromeres. They are composed of simple sequences (very short) (see MINISATELLITE REPEATS) repeated in tandem many times to form large blocks of sequence. Additionally, following the accumulation of mutations, these blocks of repeats have been repeated in tandem themselves. The degree of repetition is on the order of 1000 to 10 million at each locus. Loci are few, usually one or two per chromosome. They were called satellites since in density gradients, they often sediment as distinct, satellite bands separate from the bulk of genomic DNA owing to a distinct BASE COMPOSITION.
Repetitive Sequences, Nucleic Acid
Sequences of DNA or RNA that occur in multiple copies. There are several types: INTERSPERSED REPETITIVE SEQUENCES are copies of transposable elements (DNA TRANSPOSABLE ELEMENTS or RETROELEMENTS) dispersed throughout the genome. TERMINAL REPEAT SEQUENCES flank both ends of another sequence, for example, the long terminal repeats (LTRs) on RETROVIRUSES. Variations may be direct repeats, those occurring in the same direction, or inverted repeats, those opposite to each other in direction. TANDEM REPEAT SEQUENCES are copies which lie adjacent to each other, direct or inverted (INVERTED REPEAT SEQUENCES).
Cockroaches
DNA Probes
Species- or subspecies-specific DNA (including COMPLEMENTARY DNA; conserved genes, whole chromosomes, or whole genomes) used in hybridization studies in order to identify microorganisms, to measure DNA-DNA homologies, to group subspecies, etc. The DNA probe hybridizes with a specific mRNA, if present. Conventional techniques used for testing for the hybridization product include dot blot assays, Southern blot assays, and DNA:RNA hybrid-specific antibody tests. Conventional labels for the DNA probe include the radioisotope labels 32P and 125I and the chemical label biotin. The use of DNA probes provides a specific, sensitive, rapid, and inexpensive replacement for cell culture techniques for diagnosing infections.
Genes
Diploidy
Heteroptera
Sequence Alignment
The arrangement of two or more amino acid or base sequences from an organism or organisms in such a way as to align areas of the sequences sharing common properties. The degree of relatedness or homology between the sequences is predicted computationally or statistically based on weights assigned to the elements aligned between the sequences. This in turn can serve as a potential indicator of the genetic relatedness between the organisms.
Mosaicism
Chromatids
Either of the two longitudinally adjacent threads formed when a eukaryotic chromosome replicates prior to mitosis. The chromatids are held together at the centromere. Sister chromatids are derived from the same chromosome. (Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)
Gene Deletion
Biological Evolution
DNA-Binding Proteins
Heterozygote
Drosophila Proteins
Wasps
Tribolium
Polyploidy
Polytene Chromosomes
DNA, Complementary
Bees
Plasmids
Gene Dosage
The number of copies of a given gene present in the cell of an organism. An increase in gene dosage (by GENE DUPLICATION for example) can result in higher levels of gene product formation. GENE DOSAGE COMPENSATION mechanisms result in adjustments to the level GENE EXPRESSION when there are changes or differences in gene dosage.
DNA Primers
Nuclear Proteins
Cell Cycle Proteins
Proteins that control the CELL DIVISION CYCLE. This family of proteins includes a wide variety of classes, including CYCLIN-DEPENDENT KINASES, mitogen-activated kinases, CYCLINS, and PHOSPHOPROTEIN PHOSPHATASES as well as their putative substrates such as chromatin-associated proteins, CYTOSKELETAL PROTEINS, and TRANSCRIPTION FACTORS.
Bombyx
A genus of silkworm MOTHS in the family Bombycidae of the order LEPIDOPTERA. The family contains a single species, Bombyx mori from the Greek for silkworm + mulberry tree (on which it feeds). A native of Asia, it is sometimes reared in this country. It has long been raised for its SILK and after centuries of domestication it probably does not exist in nature. It is used extensively in experimental GENETICS. (From Borror et al., An Introduction to the Study of Insects, 4th ed, p519)
Polymorphism, Genetic
The regular and simultaneous occurrence in a single interbreeding population of two or more discontinuous genotypes. The concept includes differences in genotypes ranging in size from a single nucleotide site (POLYMORPHISM, SINGLE NUCLEOTIDE) to large nucleotide sequences visible at a chromosomal level.
Prophase
Interphase
Loss of Heterozygosity
Cosmids
Orthoptera
Genome, Human
DNA Transposable Elements
Discrete segments of DNA which can excise and reintegrate to another site in the genome. Most are inactive, i.e., have not been found to exist outside the integrated state. DNA transposable elements include bacterial IS (insertion sequence) elements, Tn elements, the maize controlling elements Ac and Ds, Drosophila P, gypsy, and pogo elements, the human Tigger elements and the Tc and mariner elements which are found throughout the animal kingdom.
Cytogenetic Analysis
Cytogenetics
Karyotype
Periplaneta
Gene Rearrangement
Spermatocytes
Aphids
Sequence Homology, Nucleic Acid
Genome
Chromatin
Chromosome Fragile Sites
Specific loci that show up during KARYOTYPING as a gap (an uncondensed stretch in closer views) on a CHROMATID arm after culturing cells under specific conditions. These sites are associated with an increase in CHROMOSOME FRAGILITY. They are classified as common or rare, and by the specific culture conditions under which they develop. Fragile site loci are named by the letters "FRA" followed by a designation for the specific chromosome, and a letter which refers to which fragile site of that chromosome (e.g. FRAXA refers to fragile site A on the X chromosome. It is a rare, folic acid-sensitive fragile site associated with FRAGILE X SYNDROME.)
Polymorphism, Restriction Fragment Length
Sex Chromosome Disorders
Saccharomyces cerevisiae
Monosomy
Escherichia coli
A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.
Sequence Tagged Sites
Short tracts of DNA sequence that are used as landmarks in GENOME mapping. In most instances, 200 to 500 base pairs of sequence define a Sequence Tagged Site (STS) that is operationally unique in the human genome (i.e., can be specifically detected by the polymerase chain reaction in the presence of all other genomic sequences). The overwhelming advantage of STSs over mapping landmarks defined in other ways is that the means of testing for the presence of a particular STS can be completely described as information in a database.
Pest Control, Biological
Genes, Dominant
Cell Nucleus
Within a eukaryotic cell, a membrane-limited body which contains chromosomes and one or more nucleoli (CELL NUCLEOLUS). The nuclear membrane consists of a double unit-type membrane which is perforated by a number of pores; the outermost membrane is continuous with the ENDOPLASMIC RETICULUM. A cell may contain more than one nucleus. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)
Polymorphism, Single Nucleotide
Contig Mapping
Gryllidae
Genetic Predisposition to Disease
Haploidy
Transcription, Genetic
Philadelphia Chromosome
An aberrant form of human CHROMOSOME 22 characterized by translocation of the distal end of chromosome 9 from 9q34, to the long arm of chromosome 22 at 22q11. It is present in the bone marrow cells of 80 to 90 per cent of patients with chronic myelocytic leukemia (LEUKEMIA, MYELOGENOUS, CHRONIC, BCR-ABL POSITIVE).
Azure Stains
Chromosomes, Archaeal
JIL-1 and Su(var)3-7 interact genetically and counteract each other's effect on position-effect variegation in Drosophila. (1/169)
(+info)Evolution of a distinct genomic domain in Drosophila: comparative analysis of the dot chromosome in Drosophila melanogaster and Drosophila virilis. (2/169)
(+info)Multiple functions for Drosophila Mcm10 suggested through analysis of two Mcm10 mutant alleles. (3/169)
(+info)Introgression of Drosophila simulans nuclear pore protein 160 in Drosophila melanogaster alone does not cause inviability but does cause female sterility. (4/169)
(+info)Statistical analysis of nondisjunction assays in Drosophila. (5/169)
(+info)Step-by-step evolution of neo-sex chromosomes in geographical populations of wild silkmoths, Samia cynthia ssp. (6/169)
(+info)Mutagenesis as a genetic research strategy. (7/169)
(+info)Coupling between microtubule sliding, plus-end growth and spindle length revealed by kinesin-8 depletion. (8/169)
(+info)
Regulation of sumoylation by dTopors during male meiosis in Drosophila melanogaster, UNCG NC DOCKS (North Carolina Digital...
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Insects. 8 (3): 68. doi:10.3390/insects8030068. PMC 5620688. PMID 28698508. "IPCN Chromosome Reports". Plants for a Future: ... in which there are more than two complete sets of chromosomes, unlike most other species. A side effect of polyploidy is a ...
Sexual differentiation
Humans, many mammals, insects and other animals have an XY sex-determination system. Humans have forty-six chromosomes, ... including two sex chromosomes, XX in females and XY in males. The Y chromosome must carry at least one essential gene which ... Other chromosomal systems exist in other taxa, such as the ZW sex-determination system in birds and the XO system in insects. ... Beyond the presence or absence of chromosomes or social/environmental factors, sexual differentiation can be regulated in part ...
Genomic imprinting
In insects, imprinting affects entire chromosomes. In some insects the entire paternal genome is silenced in male offspring, ... The imprinting produces effects similar to the mechanisms in other insects that eliminate paternally inherited chromosomes in ... on mouse chromosome 17 and KCNQ1OT1 on human chromosome 11p15.5, have been shown to be essential for the imprinting of genes in ... but do depend on which parent the chromosome originated from. This group of epigenetic changes that depend on the chromosome's ...
Endophenotype
Biomarker John B, Lewis KR (May 1966). "Chromosome variability and geographic distribution in insects". Science. 152 (3723): ... July 2008). "Replication of linkage on chromosome 7q22 and association of the regional Reelin gene with working memory in ...
Bombyx mori
Grimaldi, David A.; Engel, Michael S. (2005). Evolution of the Insects. Cambridge University Press. ISBN 978-0-521-82149-0.. . ... Bombyx mori females are also one of the few organisms with homologous chromosomes held together only by the synaptonemal ... In the US, teachers may sometimes introduce the insect life cycle to their students by raising silkworms in the classroom as a ... This fungus can spread to other insects.. *Grasserie, also known as nuclear polyhedrosis, milky disease, or hanging disease, is ...
Schizodactylus monstrosus
As the insect matures and reaches a new instar, they dig a wider, deeper and longer burrow with the diameter ranging between 1/ ... McClung, C. E. (1933). "The chromosomes of Schizodactylus monstrosus". Journal of Morphology. 55: 185-191. doi:10.1002/jmor. ... Hazra, A.K. & Tandon, S.K. (1991). "Ecology and behaviour of a sand burrowing insect, Schizodactylus monstrosus (Orthoptera: ... Islam, A.S. (1982). "Diurnal rhythm of hemocyte population in an insect, Schizodactylus monstrosus Drury". Experientia. 38 (5 ...
Bombyx mori
The genome of a lepidopteran model insect, the silkworm Bombyx mori. Insect Biochemistry and Molecular Biology 38(12): 1036- ... Bombyx mori females are also one of the few organisms with homologous chromosomes held together only by the synaptonemal ... Students have a chance to observe complete life cycles of insects from eggs to larvae to pupae to moths. The domestic silk moth ... Silk moth pupae are edible insects and are eaten in some cultures: In Assam, they are boiled for extracting silk and the boiled ...
Brunneria borealis
... is an elongated green insect with the typical raptorial forelimbs of a mantis. The adults have reduced-size ... 209-. ISBN 978-1-58544-236-2. White, M.J.D. (1948). "The Chromosomes of the Parthenogenetic Mantid Brunneria borealis". ... Insects of the Texas Lost Pines. Texas A&M University Press. pp. ...
Bignoniaceae
B chromosomes are common in Bignoniaceae. Pollination is either entomophilous (via insects), ornithophilous (via birds), or ... The chromosome number does not vary much in Bignoniaceae. The haploid (base chromosome number) is 20 for nearly every species ... sampled, but some species have very small chromosomes, making an accurate count difficult. ...
Torbjörn Caspersson
He was the first to study the giant chromosomes found in insect larvae. He studied the role of the nucleolus in protein ... Zelenin, A V; Zoshchuk N V (2000). "[The history of modern chromosome analysis. The founding contribution of the works of ... He examined the relationship between the quantity of heterochromatin (chromosomes with few genes) and the rate of growth of ... This banding method permits the accurate identification of all 22 autosomes and the X and Y chromosomes. This technique ...
Sex linkage
... since humans have several times as many genes on the X chromosome than the Y chromosome. Only females are able to be carriers ... Examples: female sterility in Drosophila; and many polymorphic characters in insects, especially in relation to mimicry. ... is present on a sex chromosome (allosome) rather than a non-sex chromosome (autosome). In humans, these are termed X-linked ... Fur color in domestic cats: the gene that causes orange pigment is on the X chromosome; thus a Calico or tortoiseshell cat, ...
Selfish genetic element
"Genetic control of insect population. I. Cage studies of chromosome replacement by compound autosomes in Drosophila ... B chromosomes[edit]. B chromosomes refer to chromosomes that are not required for the viability or fertility of the organism, ... B chromosomes were first detected over a century ago.[63] Though typically smaller than normal chromosomes, their gene poor, ... Douglas RN, Birchler JA (2017). "B Chromosomes". In Bhat T, Wani A (eds.). Chromosome Structure and Aberrations. New Delhi: ...
Chilocorus stigma
The chromosomes (karyotype) of Chilocorus stigma vary from one individual to another, in both the number of chromosomes ( ... It is a beneficial insect, and is useful in both natural wood stands and commercial forests such as orchards and citrus groves ... In order to preserve the benefits of this insect, pesticide users are encouraged to use natural alternatives to pesticide in ... CS1 maint: discouraged parameter (link) Jerry A. Powell and Charles L. Hogue (1980). California Insects. University of ...
Wētā
... is a loanword, from the Māori word wētā, which refers to this whole group of large insects; some types of wētā (see below ... The North Island species each have a distinctive set of chromosomes (karyotype). When the territories of species overlap, as ... "Book of Insect Records". Archived from the original on 3 July 2006. Retrieved 20 May 2006. Morgan-Richards, M (1997). " ... Giant wētā (wētā punga in Māori) are large by insect standards. They are heavy herbivorous Orthoptera with a body length of up ...
Homeotic selector gene
Every insect has six legs, one pair found on each of the three thoracic segments while other arthropods have a variable number ... Collinearity is found between the order of the genes on the chromosome and the order in which the genes are expressed along the ... These genes are grouped similarly to the Hox complex found in insects. The mouse has four complexes, HoxA, HoxB, HoxC, and HoxD ... Each of the four mammalian Hox complexes has a rough counterpart in the insect complex. The theory behind this evolutionary ...
Microevolution
"Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect". Proc. Natl. Acad. Sci. U.S.A. 99 (22): ... 2000). "Chromosome Mutation I: Changes in Chromosome Structure: Introduction". An Introduction to Genetic Analysis (7th ed.). ... or multiple chromosomes fuse, and cite the chromosome difference between humans and the other great apes as an example. ... Such hybrids are generally infertile, due to the two different sets of chromosomes being unable to pair up during meiosis. In ...
Selfish genetic element
Fitz-Earle M, Holm DG, Suzuki DT (July 1973). "Genetic control of insect population. I. Cage studies of chromosome replacement ... Discussing B chromosomes in plants he wrote: In many cases these chromosomes have no useful function at all to the species ... B chromosomes refer to chromosomes that are not required for the viability or fertility of the organism, but exist in addition ... B chromosomes were first detected over a century ago. Though typically smaller than normal chromosomes, their gene poor, ...
Evolution
October 29, 2002). "Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect". Proc. Natl. Acad. ... Indeed, chromosome doubling within a species may be a common cause of reproductive isolation, as half the doubled chromosomes ... This allows the chromosomes from each parental species to form matching pairs during meiosis, since each parent's chromosomes ... An extreme case is the eusociality found in social insects, such as bees, termites and ants, where sterile insects feed and ...
Population genetics
"Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect". Proceedings of the National Academy of ... One common approach is to look for regions of high linkage disequilibrium and low genetic variance along the chromosome, to ... especially with genes located nearby on the same chromosome. Recombination breaks up this linkage disequilibrium too slowly to ... "The Rate of Adaptation in Large Sexual Populations with Linear Chromosomes". Genetics. 196 (4): 1167-1183. doi:10.1534/genetics ...
Horizontal gene transfer
"Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect". Proceedings of the National Academy of ... Bites from insects in the family Reduviidae (assassin bugs) can, via a parasite, infect humans with the trypanosomal Chagas ... In order for a bacterium to bind, take up and recombine exogenous DNA into its chromosome, it must become competent, that is, ... The DNA integrated into the host chromosome is usually (but with infrequent exceptions) derived from another bacterium of the ...
Haplodiploidy
The diploid queen has 32 chromosomes and the haploid drones have 16 chromosomes. Drones produce sperm cells that contain their ... Grimaldi, D.; Engel M.S. (2005). The evolution of the insects. Cambridge University Press. p. 408. ISBN 0-521-82149-5.. CS1 ... Y chromosome. References[edit]. *^ King, R.C; Stansfield, W.D.; Mulligan, P.K. (2006). A dictionary of genetics (7th ed.). ... As long as a female has mated with only one male, all her daughters share a complete set of chromosomes from that male. In ...
Microsatellite
The telomeres at the ends of the chromosomes, thought to be involved in ageing/senescence, consist of repetitive DNA, with the ... Similarly, insects have shorter repeat motifs in their telomeres that could arguably be considered microsatellites. ... This is likely due to homologous chromosomes with arms of unequal lengths causing instability during meiosis.[19] ... Direct estimates of microsatellite mutation rates have been made in numerous organisms, from insects to humans. In the desert ...
Lasthenia conjugens
According to Greene, the chromosome characteristic is: 2n=12. Lasthenia conjugens relies upon insect pollination for ... An alternative conclusion is that members of one particular insect family, Sciaridae, are also efficient pollinators of L. ... conjugens, since it was the only insect family to visit the restoration colonies in significant numbers (the specialist bees ...
Ajuga pyramidalis
The chromosome number is 2n = 32. The bracts in the inflorescence form effective shelters for the flowers from rain, their red- ... The shaggy hairiness of the calyx protects the flower against small, crawling insects. The nectar is additionally secured by a ...
Oligoryzomys nigripes
They scavenge for nutrient sources in things such as fruits, insects, and seeds. There are 31 pairs of chromosomes found in the ... There are 60 autosomal chromosomes and 2 sex chromosomes found in this species. Weksler et al., 2008 Musser, G.G.; Carleton, M. ... de Almeida, Eunice Judith Cardoso; Yonenaga-Yassuda, Yatiyo (January 1991). "Pericentric inversions and sex chromosome ...
Wolbachia
"Microorganisms associated with chromosome destruction and reproductive isolation between two insect species" (PDF). Nature. 346 ... 2003). "14: Insect pest control using Wolbachia and/or radiation". Insect Symbiosis. p. 230. ISBN 9780849341946. Forsman M, ... Outside of insects, Wolbachia infects a variety of isopod species, spiders, mites, and many species of filarial nematodes (a ... One study concluded that more than 16% of neotropical insect species carry bacteria of this genus, and as many as 25 to 70% of ...
Bickham's little yellow bat
It is insectivorous, catching and consuming insects while flying. It is found in Central America where its range includes Costa ... It is a diploid organism with two sets of each chromosome (2n=34). It has a dental formula of 1.1.1.33.1.2.3 for a total of 30 ...
Pygopristis denticulata
It has 62 chromosomes. This fish possesses powerful dentition that can cause serious bites. It has scales. Froese, Rainer and ... They usually feed on aquatic insects, small fish, and fruits. P. denticulata has pentacuspid teeth and a middle cusp that is ...
Pseudo-arrhenotoky
The adult cells have one set of inactive H chromosomes and one set of euchromatin E chromosomes. These H chromosomes are ... This phenomenon occurs in certain mites, beetles and mealybugs and scale insects. When the males have a diploid number of ... In a few other species all the cells in an adult are haploid due to elimination of the paternal chromosomes at an early ... The paternal chromosomes are inactivated by heterochromatization in all the cells at an early embryonic stage. ...
Bx1 benzoxazin1
1997 ), on chromosome 7, another by igl1, indole-3-glycerol phosphate lyase1(Frey et al. 1997, on chromosome 1, and another by ... Function Maize gene for first step in biosynthesis of benzoxazin, which aids in resistance to insect pests, pathogenic fungi ... AB chromosome translocation analyses place on short arm of chromosome 4 (4S; Simcox and Weber 1985 ). There is close linkage to ... Meihls, L. N.; Kaur, H.; Jander, G. (2012). "Natural Variation in Maize Defense against Insect Herbivores". Cold Spring Harbor ...
Darwin Medal - Simple English Wikipedia, the free encyclopedia
In recognition of his analysis of pattern formation during insect segmentation, and of his contribution to understanding how ... separate sexes and sex chromosomes, segregation distortion and repetitive DNA. ...
Evolution of biological complexity
Usually organisms that have a higher rate of reproduction than their competitors have an evolutionary advantage. Consequently, organisms can evolve to become simpler and thus multiply faster and produce more offspring, as they require fewer resources to reproduce. A good example are parasites such as Plasmodium - the parasite responsible for malaria - and mycoplasma; these organisms often dispense with traits that are made unnecessary through parasitism on a host.[7] A lineage can also dispense with complexity when a particular complex trait merely provides no selective advantage in a particular environment. Loss of this trait need not necessarily confer a selective advantage, but may be lost due to the accumulation of mutations if its loss does not confer an immediate selective disadvantage.[8] For example, a parasitic organism may dispense with the synthetic pathway of a metabolite where it can readily scavenge that metabolite from its host. Discarding this synthesis may not necessarily allow ...
Genome - Simple English Wikipedia, the free encyclopedia
Insect, Apis mellifera aka honey bee 1.77×109 Fish, Tetraodon nigroviridis, type of Puffer fish 3.85×108 Smallest vertebrate ... Hans Winkler, Professor of Botany at the University of Hamburg, Germany, as a combination of the words gene and chromosome.. . ... "I propose the expression genome for the haploid chromosome set, which, together with the pertinent protoplasm, specifies the ... However, no single haploid chromosome set defines even the DNA of a species. Because of the huge variety of alleles carried by ...
Brassicaceae
The number of homologous chromosome sets varies from four (n=4) in some Physaria and Stenopetalum species, five (n=5) in other ... Ecological and Environmental Physiology of Insects. Ecological and Environmental Physiology Series. 3. Oxford biological.. ... Some insect herbivores have developed counter adaptations such as rapid absorption of the glucosinates, quick alternative ... Parasitoid wasps that feed on such insect herbivores are attracted to the chemical compounds released by the plants, and thus ...
Inbreeding
"Insect Incest Produces Healthy Offspring". 8 December 2011.. *^ Gardner A, Ross L (August 2011). "The evolution of ... By pairing chromosomes of similar genomes, the chance for these recessive alleles to pair and become homozygous greatly ... Bed bugs: North Carolina State University found that bedbugs, in contrast to most other insects, tolerate incest and are able ... Cottony cushion scales: 'It turns out that females in these hermaphrodite insects are not really fertilizing their eggs ...
Pecan
... is a 32 chromosome species that readily hybridizes with other 32 chromosome members of the Carya genus, such as Carya ... Various insects feed on the leaves stems and developing nuts. These include ambrosia beetles, twig girdlers, pecan nut ... ovata, Carya laciniosa, Carya cordiformis and has been reported to hybridize with 64 chromosome species such as Carya tomentosa ...
Crab-eating fox
Genetically, there are 74 diploid chromosomes (36 pairs). Appearance[edit]. The crab-eating fox is predominantly greyish-brown ... It is an opportunist and an omnivore, preferring insects or meat from rodents and birds when available. Other foods readily ... while during the dry season it contains more insects.[9] The crab-eating fox contributes to the control of rodents and harmful ... consumed include turtle eggs, tortoises, fruit, eggs, crustaceans, insects, lizards and carrion. Their diet is varied and has ...
Citrus
... plants are very liable to infestation by aphids, whitefly, and scale insects (e.g. California red scale). Also rather ... "Next generation haplotyping to decipher nuclear genomic interspecific admixture in Citrusspecies: analysis of chromosome 2" ... The Asian citrus psyllid is an aphid-like insect that feeds on the leaves and stems of citrus trees and other citrus-like ...
Acid alpha-glucosidase
This article on a gene on human chromosome 17 is a stub. You can help Wikipedia by expanding it.. *v ... "Temporal expression of HIV-1 envelope proteins in baculovirus-infected insect cells: implications for glycosylation and CD4 ... It is functionally similar to glycogen debranching enzyme, but is on a different chromosome, processed differently by the cell ...
Iris setosa
Specimens from Primorskii Krai in Russia, were found to have a chromosome count of 2n=28. Using chromosome research, Iris ... The plant is self-fertile, being hermaphrodite (have both male and female organs) and it is pollinated by insects. The stamens ... having two sets of chromosomes. This can be used to identify hybrids and classification of groupings. It has a chromosome count ... It has a chromosome numbers of 2n=54, but they may be triploids. Iris setosa var. nasuensis was found near the city of Nasu on ...
Embryology
Thus, a fly whose chromosomes are mutant in both copies of the Bicoid gene but who is born from a mother carrying one normal ... The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes include the ... For instance, while spiders proceed directly from egg to adult form, many insects develop through at least one larval stage. ...
Mosaic (genetics)
... called 46/47 XY/XXY mosaic wherein some of the patient's cells contain XY chromosomes, and some contain XXY chromosomes. The 46 ... "A new behavioral bioassay for an analysis of sexual attraction and pheromones in insects". Journal of Experimental Zoology. 192 ... where a fly possessing two X chromosomes is a female and a fly possessing a single X chromosome is a sterile male, a loss of an ... This may be caused by a nondisjunction event in an early mitosis, resulting in a loss of a chromosome from some trisomic cells. ...
Honey bee
"Flowers set more seeds when visited by wild insects, and the more plants that were visited by wild insects, the more likely ... Workers have two sets of chromosomes.[60] They are produced from an egg that the queen has selectively fertilized from stored ... "Journal of Insect Behavior. 23 (6): 459-471. doi:10.1007/s10905-010-9229-5. ISSN 0892-7553. PMC 2955239. PMID 21037953.. ... A honey bee (or honeybee) is a eusocial, flying insect within the genus Apis of the bee clade. They are known for construction ...
Glossary of biology
... or W chromosome rather than by the presence of two X chromosomes or two Z chromosomes.. basal body. An organelle formed from a ... Many organisms, such as bacteria, insects, and plants, are capable of naturally producing clones through asexual reproduction. ... chromosome. A threadlike strand of DNA in the cell nucleus that carries the genes in a linear order.. cilia. circadian rhythm. ... In eukaryotic cells, the part of the cell cycle during which the division of the nucleus takes place and duplicated chromosomes ...
Tomato
After an insect attack tomato plants produce systemin, a plant peptide hormone . Systemin activates defensive mechanisms, such ... This trait/allele is physically linked (or is very close) to the desired allele along the chromosome. In introducing the ... The Potato Tuber moth (Phthorimaea operculella) is an oligophagous insect that prefers to feed on plants of the family ... Lepidoptera: Gelechiidae), in relation to their host plants". Journal of Insect Behavior. 1 (3): 261-275. doi:10.1007/ ...
Common ostrich
They mainly feed on seeds, shrubs, grass, fruit and flowers;[7][10] occasionally they also eat insects such as locusts. Lacking ... Upon view, the myocardial cells are observed to have large densely packed chromosomes within the nucleus.[69] ...
Phylogenetics
In biology, phylogenetics /ˌfaɪloʊdʒəˈnɛtɪks, -lə-/[1][2] (from Greek φυλή/φῦλον (phylé/phylon) "tribe, clan, race", and γενετικός (genetikós) "origin, source, birth")[3] is a part of systematics that addresses the inference of the evolutionary history and relationships among or within groups of organisms (e.g. species, or more inclusive taxa). These relationships are hypothesized by phylogenetic inference methods that evaluate observed heritable traits, such as DNA sequences, protein amino acid sequences, or morphology, often under a specified model of evolution of these traits. The result of such an analysis is a phylogeny (also known as a phylogenetic tree)-a diagrammatic hypothesis of relationships that reflects the evolutionary history of a group of organisms.[4] The tips of a phylogenetic tree can be living taxa or fossils, and represent the 'end', or the present, in an evolutionary lineage. A phylogenetic diagram can be rooted or unrooted. A rooted tree ...
Y chromosome
Such groups include monotremes, Drosophila, some other insects, some fish, some reptiles, and some plants. In Drosophila ... Males have one Y chromosome and one X chromosome, while females have two X chromosomes. In mammals, the Y chromosome contains a ... Stevens proposed that chromosomes always existed in pairs and that the Y chromosome was the pair of the X chromosome discovered ... More than two Y chromosomesEdit. Greater degrees of Y chromosome polysomy (having more than one extra copy of the Y chromosome ...
Platypus
These ten chromosomes form five unique pairs of XY in males and XX in females, i.e. males are X1Y1X2Y2X3Y3X4Y4X5Y5.[76] One of ... The platypus is a carnivore: it feeds on annelid worms, insect larvae, freshwater shrimp, and freshwater yabby (crayfish) that ... "In the platypus a meiotic chain of ten sex chromosomes shares genes with the bird Z and mammal X chromosomes". Nature. 432 ( ... the X chromosomes of the platypus has great homology to the bird Z chromosome.[77] The platypus genome also has both reptilian ...
Multicellular organism
One hypothesis for the origin of multicellularity is that a group of function-specific cells aggregated into a slug-like mass called a grex, which moved as a multicellular unit. This is essentially what slime molds do. Another hypothesis is that a primitive cell underwent nucleus division, thereby becoming a coenocyte. A membrane would then form around each nucleus (and the cellular space and organelles occupied in the space), thereby resulting in a group of connected cells in one organism (this mechanism is observable in Drosophila). A third hypothesis is that as a unicellular organism divided, the daughter cells failed to separate, resulting in a conglomeration of identical cells in one organism, which could later develop specialized tissues. This is what plant and animal embryos do as well as colonial choanoflagellates.[26][27] Because the first multicellular organisms were simple, soft organisms lacking bone, shell or other hard body parts, they are not well preserved in the fossil ...
Carrion crow
Though an eater of carrion of all kinds, the carrion crow will eat insects, earthworms, grain, fruits, seeds, small mammals, ... situated on avian chromosome 18) in the hooded crow, which imparts the lighter plumage colouration on its torso.[8] Thus the ...
Bird
Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ).[62] ... Some hunt insects by suddenly attacking from a branch. Those species that seek pest insects are considered beneficial ' ... Chromosomes. Birds have two sexes: either female or male. The sex of birds is determined by the Z and W sex chromosomes, rather ... Many birds glean for insects, invertebrates, fruit, or seeds. ... than by the X and Y chromosomes present in mammals. ...
Evolution of mammals
... forelimbs and back suggest that it broke open the nest of social insects to prey on them (probably termites, as ants had not ... This change may have allowed these early mammals to hunt insects at night when dinosaurs were not active.[140] ...
Children of Time (novel)
"Bugging Out: The Must-Read Insect Books of the Summer". Wired.com. Conde Nast. Archived from the original on May 4, 2017 ... The Calcutta Chromosome (1997). *The Sparrow (1998). *Dreaming in Smoke (1999). *Distraction (2000) ...
Middle Paleolithic
The earliest evidence of behavioral modernity first appears during the Middle Paleolithic; undisputed evidence of behavioral modernity, however, only becomes common during the following Upper Paleolithic period.[1] Middle Paleolithic burials at sites such as Krapina in Croatia (dated to c. 130,000 BP) and the Qafzeh and Es Skhul caves in Israel (c. 100,000 BP) have led some anthropologists and archeologists (such as Philip Lieberman) to believe that Middle Paleolithic cultures may have possessed a developing religious ideology which included concepts such as an afterlife; other scholars suggest the bodies were buried for secular reasons.[3][4] According to recent[when?] archeological findings from Homo heidelbergensis sites in the Atapuerca Mountains, the practice of intentional burial may have begun much earlier during the late Lower Paleolithic, but this theory is widely questioned in the scientific community. Cut-marks on Neandertal bones from various sites - such as Combe Grenal and the ...
Cytochrome c
... vertebrate cytochromes c all have dipole moment of approximately 320 debye while cytochromes c of plants and insects have ... Genes on human chromosome 7. *Cellular respiration. *Cytochromes. *Programmed cell death. *Peripheral membrane proteins ...
Introduction to genetics
Chromosomes are tiny packages which contain one DNA molecule and its associated proteins. Humans have 46 chromosomes (23 pairs ... The insecticide kills insects that eat the plants, but is harmless to people.[20] In these plants, the new genes are put into ... Chromosome. A package for carrying DNA in the cells. They contain a single long piece of DNA that is wound up and bunched ... Chromosomes all contain DNA made up of four nucleotides, abbreviated C (cytosine), G (guanine), A (adenine), or T (thymine), ...
Mating
Courtship is often facilitated through forming groups, called leks, in flies and many other insects. For example, male ... Mating in these cases involves the pairing of individuals, accompanied by the pairing of their homologous chromosomes and then ... In some terrestrial arthropods, including insects representing basal (primitive) phylogenetic clades, the male deposits ... In advanced groups of insects, the male uses its aedeagus, a structure formed from the terminal segments of the abdomen, to ...
Dingo
The wolf-like canids are a group of large carnivores that are genetically closely related because their chromosomes number 78, ... insects, and seeds.[22][23][24] The dingo's competitors include the native quoll, the introduced European red fox and the feral ... insects, fish, crabs, and frogs (28 species).[23][24][22] The relative proportions of prey are much the same across Australia, ...
The Chromosomes of Insects | Science
Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect | PNAS
Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect. Natsuko Kondo, Naruo Nikoh, Nobuyuki ... Insect-induced effects on plants and possible effectors used by galling and leaf-mining insects to manipulate their host-plant ... Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect ... Genome fragment of Wolbachia endosymbiont transferred to X chromosome of host insect ...
Micromanipulation of Chromosomes in Insect Spermatocytes | Protocol
To pull on or move a chromosome, focus on a chromosome near the top of the cell.. NOTE: These chromosomes are easier to ... Micromanipulation of Chromosomes in Insect Spermatocytes. Nicolas K.H. Lin1, Ryder Nance2, Jane Szybist2, Alan Cheville2, ... either apply tension to the chromosome or apply sufficient tension to detach a chromosome from the spindle. Once a chromosome ... Lin, N. K., Nance, R., Szybist, J., Cheville, A., Paliulis, L. V. Micromanipulation of Chromosomes in Insect Spermatocytes. J. ...
Recent Articles | Insects, Developmental Biology And Culture | The Scientist Magazine®
X chromosome News, Research
Research provides opportunities for biological control of insect-borne pathogens Researchers from INRA, CIRAD, CEA, the ... Presence of XX sex chromosomes increases risk of heart attacks and coronary artery disease New research at the University of ... Not every embryo contains 46 perfect chromosomes. Some have more, others have fewer. The result is a common abnormality known ... Scientists at Johns Hopkins say they have found that people born with abnormally short chromosome endcaps, or telomeres, have ...
Chromosome 6 News, Research
Research provides opportunities for biological control of insect-borne pathogens Researchers from INRA, CIRAD, CEA, the ... Chromosome 6 News and Research. RSS Humans normally have 46 chromosomes in each cell, divided into 23 pairs. Two copies of ... Chromosome 6 likely contains between 1,100 and 1,600 genes.. Genes on chromosome 6 are among the estimated 20,000 to 25,000 ... Breakthrough chromosome imaging could aid in development of new treatments Chromosomes, each containing hundreds or thousands ...
List of organisms by chromosome count - Wikipedia
This insect has one of the highest chromosome numbers among all animals. [115] ... Males have XY sex chromosomes and females have XX sex chromosomes. The sex chromosomes are the largest chromosomes and ... The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, ... Shared synteny of human chromosome 17 loci in Canids. *An atlas of the chromosome numbers in animals (1951); PDF downloads of ...
Polytene Chromosomes From An Insect Lm X1000 Stock Photo | Getty Images
Evolutionary and developmental dynamics of sex-biased gene expression in common frogs with proto-Y chromosomes | SpringerLink
Background The patterns of gene expression on highly differentiated sex chromosomes differ drastically from those on autosomes ... or insects [4, 12, 13, 14, 15, 16], and with a focus on adult tissues (so that little is known about the dynamics of sex-biased ... In proto-sex chromosomes (where X and Y chromosomes differ only at the sex-determining locus), male-beneficial mutations on the ... Sex-chromosome recombination in these rare XY females produces XY° sons with proto-sex chromosomes [31, 34]. ...
Evolutionary insights into the genomic organization of major ribosomal DNA in ant chromosomes. | Insect Mol Biol;30(3): 340...
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Insect Mol ... Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Insect Mol ... The evolutionary dynamics of the karyotype may affect the organization of rDNA genes within chromosomes. In this study, we ... Therefore, rDNA genes restricted to a single chromosome pair seem to be a plesiomorphic feature in ants, while multiple rDNA ...
Picture this: Chromosomes look different than you think - Innovations Report
Decoding gigantic insect genome could help tackle devastating locust crises. 27.11.2020. / Life Sciences ... To discover what each chromosome looks like in every cell in the human body will take far more work than one lab can take on ... But areas with few genes ("gene-poor") only come together if they share the same chromosome. One theory is that gene-rich areas ... In high school textbooks, human chromosomes are pictured as wonky Xs like two hotdogs jammed together. But those images are far ...
The recombination of chromosomes: a controlled game of love and chance? - Innovations Report
Decoding gigantic insect genome could help tackle devastating locust crises. 27.11.2020. / Life Sciences ... The number of exchanges will vary from one organism or chromosome to another (on average, one to five per chromosome, and up to ... 2n chromosomes (diploid cell) become n chromosomes (haploid cell). ... Each pair of chromosomes - one of paternal origin, the other maternal - is positioned independently of the other pairs on the ...
Cross-Species Y Chromosome Function Between Malaria Vectors of the Anopheles gambiae Species Complex | Genetics
2007 X and Y chromosome inheritance and mixtures of rDNA intergenic spacer regions in Anopheles gambiae. Insect Mol. Biol. 16: ... 2013 Y chromosome evolution: emerging insights into processes of Y chromosome degeneration. Nat. Rev. Genet. 14: 113-124. ... Sex chromosomes play an important role in reproductive isolation; however, it is mostly the gene-rich X chromosome that has ... Analysis of Y chromosome sequence content in introgressed males. To assess whether introgression of the A. gambiae Y chromosome ...
Chromatid segregation at anaphase requires the barren product, a novel chromosome-associated protein that interacts with...
Recent Articles | Chromosome Folding Domains, Culture And Evolution | The Scientist Magazine®
PDF] TTAGG Telomeric Repeats in Chromosomes of Some Insects and Other Arthropods | Semantic Scholar
... and Southern hybridization in ten insect species and two other arthropods. (TTAGG)n-containing telomeres were found in three ... n was a phylogenetically ancestral telomere motif in the insect lineage but was lost independently in different groups, being ... TTAGG Telomeric Repeats in Chromosomes of Some Insects and Other Arthropods. @article{Sahara2004TTAGGTR, title={TTAGG Telomeric ... Repeats in Chromosomes of Some Insects and Other Arthropods}, author={K. Sahara and F. Marec and W. Traut}, journal={Chromosome ...
RED1: a yeast gene required for the segregation of chromosomes during the reductional division of meiosis | PNAS
Nutrient dilution and insect decline. A study finds that the dilution of nutrients in plants, alongside climate factors, drives ... RED1: a yeast gene required for the segregation of chromosomes during the reductional division of meiosis. B Rockmill and G S ... RED1: a yeast gene required for the segregation of chromosomes during the reductional division of meiosis ... Expression and DNA sequence of RED1, a gene required for meiosis I chromosome segregation in yeast ...
Table of Contents - January 29, 1982, 215 (4532) | Science
Cytogenetic markers reveal a reinforcement of variation in the tension zone between chromosome races in the brachypterous...
B chromosomes were found in specimens belonging to both main races from nine out of 22 localities. Four types of X chromosomes ... Telomeric signals were usually detected at the distal and/or subdistal position of the autosomes; however, some chromosome ends ... Insects 2, 49-61 (2011). ... sex chromosome/s and in one type of B chromosome (see below) as ... n probes in both autosomes and sex chromosomes. Variation in the intensity of signals in chromosomes, including sex chromosomes ...
Perturbation of nuclear architecture by long-distance chromosome interactions
... Cell. 1996 May 31;85(5):745-59. doi: 10.1016/ ... Moreover, they provide direct evidence for long-range chromosome interactions and their impact on three-dimensional nuclear ... during larval development this insertion physically associates with other heterochromatic regions on the same chromosome in a ... Genes, Insect* * Heterochromatin / genetics * Heterochromatin / ultrastructure * In Situ Hybridization, Fluorescence * Male * ...
BIO2022 : Molecular Biology and Development (Inactive) - Undergraduate Study - Newcastle University
2. Embryogenesis in insects.. Teaching Methods. Teaching Activities. Category. Activity. Number. Length. Student Hours. Comment ... Eukaryotic genomes; chromosomes and chromatin. - Gene expression and its regulation in eukaryotes. - History and basic ... Development of the insect body plan. - Hox genes and the evolution of body plans. - Vertebrate development. Practical exercises ...
3,697 Best SCIENCE OF LIFE stories | Olive Oil, Insects, Spirituality - Flipboard
New Human-Chimp Chromosome 2 Data Challenge Common Ancestry Claims | The Institute for Creation Research
Gods Marvelous Insects. Did you know that the moth smells with its antennae? Whether we look at moths, ants, bombardier ... chromosome 2). This is thought to explain the difference in the 23 chromosomes humans have and the 24 chromosomes found in ... Our research on the human chromosome 2 is tentatively scheduled to be published in the Journal of Creation. A brief summary of ... Bergmans and my recent study on human telomeres related to chromosomes, evolution, and intelligent design is now in print in ...
Insect Histology: Practical Laboratory Techniques | Entomology | Life Sciences | Subjects | Wiley
12 Preparation of chromosomes 258. References 288. 13 Preparation of other specific insect organs and tissues 290 ... Although his research focused on the ecology of insects and insect-plant interactions, he also has an interest in insect ... This title is a much needed update of Barbosas self-published Manual of Basic Techniques in Insect Histology. It is a ... Insect Histology is designed as a resource for student and professional researchers, in academia and industry, who require ...
Interchromosomal duplications on the Bactrocera oleae Y chromosome imply a distinct evolutionary origin of the sex chromosomes...
Genes, Insect / genetics. Male. Molecular Sequence Data. Promoter Regions, Genetic / genetics. Tephritidae / genetics*. Y ... The newly identified sequences of the B. oleae Y chromosome have no related sequences on the Drosophila sex chromosomes. This ... The sequences here isolated from the B. oleae Y chromosome have no known related sequences on the Y chromosomes of other ... Its Y chromosome is minute and highly heterochromatic, and displays high heteromorphism with the X chromosome.. METHODOLOGY/ ...
Entomology Glossary: Huge List Of 578 Insect Terms
Chorion. The inner shell or covering of the insect egg.. Chromosomes. At cell division the dark-staining, rod-shaped structures ... Home , Insects , Entomological Glossary. Entomology Glossary: Huge List Of 578 Insect Terms. This is a collection of ... Comb. A group of spines on the leg of an insect specifically used for cleaning other parts of the insects body.. Commensalism. ... Tympanum. The auditory membrane or ear-drum of various insects.. Type. The type specimen of a species is the actual insect from ...
Recent Articles | Biofuels, Developmental Biology And Evolution | The Scientist Magazine®
Insects Neural Learning and Memory Center Discovered in Crustaceans. By Catherine Offord , December 1, 2017 ... Captivated by Chromosomes. By Anna Azvolinsky , December 1, 2017 Peering through a microscope since age 14, Joseph Gall, now 89 ... Aggressive little marine predators, mantis shrimps possess a mushroom body that appears identical to the one found in insects. ...
A neoW chromosome drives speciation | Proceedings of the Royal Society of London B: Biological Sciences
One useful group of insects in which to examine the effects of male-killing are the butterflies. In East Africa, the African ... dorippus Z chromosome; light blue, chrysippus Z chromosome; yellow, W chromosome unfused; green, W chromosome fused. Wild-type ... 2012 Sex chromosome evolution in moths and butterflies. Chromosome Res. 20, 83-94. (doi:10.1007/s10577-011-9262-z). ... The lower pair shows the Z chromosomes of dorippus (dark blue) and chrysippus (light blue); the yellow W chromosome is always ...
Frontiers | Development and Evaluation of Chromosome Segment Substitution Lines Carrying Overlapping Chromosome Segments of the...
In particular, chromosome segment substitution lines (CSSLs) are most powerful tools for the detection and precise mapping of ... To further facilitate gene mapping, heterozygous chromosome segment substitution lines (HCSSLs) were also produced, which were ... To further facilitate gene mapping, heterozygous chromosome segment substitution lines (HCSSLs) were also produced, which were ... In particular, chromosome segment substitution lines (CSSLs) are most powerful tools for the detection and precise mapping of ...
Karyotype evolution and flexible (conventional versus inverted) meiosis in insects with holocentric chromosomes: a case study...
Karyotype evolution and flexible (conventional versus inverted) meiosis in insects with holocentric chromosomes: a case study ... Karyotype evolution and flexible (conventional versus inverted) meiosis in insects with holocentric chromosomes: a case study ... Karyotype evolution and flexible (conventional versus inverted) meiosis in insects with holocentric chromosomes: a case study ... T1 - Karyotype evolution and flexible (conventional versus inverted) meiosis in insects with holocentric chromosomes: a case ...
GenesSpeciesHomologous ChromosomesGenomesDrosophilaAutosomesGeneticSegregationEvolutionaryMolecularHuman chromosomesOrganismChromatinGeneticallySequencesAutosomePair of sex chromosomesMitosisEvolutionCell nucleiPolytene chromosomesChromatidsSets of chromosomesVectorsFemalesWolbachiaAncestralAcrocentric chromosomesHolocentric chromosomesFluorescence in situ hybriDiploid cellTelomeresProto-sex chromosomeEukaryotesArthropodsSequenceHybridizationEmbryonicDefectsMitoticMetaphaseGene expressionMammalsGenomicsBacterial artificialPaternalPolymorphismHeterochromatinPopulationsInteractionsCytogeneticRecombinationCentromereHigher chromosomeJournal of Insect ScienceSexesHemipteraTelomeric repeatsDeterminationPestMale sexMeiosisSpermatocytesMechanisms
Genes44
- Identifying genes on each chromosome is an active area of genetic research. (news-medical.net)
- Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. (news-medical.net)
- Chromosome 6 likely contains between 1,100 and 1,600 genes. (news-medical.net)
- Genes on chromosome 6 are among the estimated 20,000 to 25,000 total genes in the human genome. (news-medical.net)
- Chromosomes, each containing hundreds or thousands of genes, act like a detailed instruction manual for how cells should develop and behave. (news-medical.net)
- The evolutionary dynamics of the karyotype may affect the organization of rDNA genes within chromosomes . (bvsalud.org)
- Furthermore, a survey of published rDNA cytogenetic data for 50 additional species was performed, which allowed us to detect the evolutionary patterns of these genes in ant chromosomes . (bvsalud.org)
- Most of the species (48 out of 63) had rDNA genes restricted to a single chromosome pair in their intrachromosomal regions. (bvsalud.org)
- The position of rDNA genes within the chromosomes appears to hinder their dispersal throughout the genome , as translocations and ectopic recombination are uncommon in intrachromosomal regions because they can generate meiotic abnormalities . (bvsalud.org)
- Therefore, rDNA genes restricted to a single chromosome pair seem to be a plesiomorphic feature in ants , while multiple rDNA sites, observed in distinct subfamilies, may have independent origins in different genera. (bvsalud.org)
- As a result, X chromosomes are often enriched in female-biased genes (feminization) and Z chromosomes in male-biased genes (masculinization). (springer.com)
- This challenges the notion that sexually antagonistic genes play a central role in the initial stages of sex-chromosome evolution. (springer.com)
- The same holds for female-heterogametic systems, in which W chromosomes are female limited, while Z chromosomes spend two thirds of their time in males and hence are expected to accumulate male-beneficial genes. (springer.com)
- Sexually antagonistic genes are hypothesized to play a key role in the evolution of sex chromosomes. (springer.com)
- With their high-resolution images, Zhuang and team determined that areas with lots of genes ("gene-rich") tend to flock to similar areas on any chromosome. (innovations-report.com)
- During the formation of reproductive cells or gametes, sexual reproduction is accompanied by an exchange of genes between the two chromosomes inherited from the parents. (innovations-report.com)
- In a gamete, on a given chromosome, there are genes inherited from both the father and mother (see illustration). (innovations-report.com)
- This initial shuffling of the genes is followed by a random distribution of chromosomes at the next stage of meiosis. (innovations-report.com)
- While the Anopheline Y had previously been implicated in male mating behavior, recent data from the Anopheles gambiae complex suggests that, apart from the putative primary sex-determiner, no other genes are conserved on the Y. Studying the functional basis of the evolutionary divergence of the Y chromosome in the gambiae complex is complicated by complete F1 male hybrid sterility. (genetics.org)
- In contrast to comparable experiments in Drosophila , we find that the presence of a heterospecific Y chromosome has no significant effect on the expression of A. arabiensis genes, and transcriptional differences can be explained almost exclusively as a direct consequence of transcripts arising from sequence elements present on the A. gambiae Y chromosome itself. (genetics.org)
- Exhaustive PCR surveys revealed that 31 and 30 of 214 Wolbachia genes examined were detected from the two insect populations, respectively. (royalsocietypublishing.org)
- Expression of Foreign Genes in Cultured Insect Cells Using a Recombinant Baculovirus Vector. (barnesandnoble.com)
- Compared with other sequenced insect genomes, the A. mellifera genome has high A+T and CpG contents, lacks major transposon families, evolves more slowly, and is more similar to vertebrates for circadian rhythm, RNA interference and DNA methylation genes, among others. (nih.gov)
- Although the accumulation on the sex chromosome of genes responsible for postzygotic barriers is a well-known phenomenon, less attention has been given to the genomic distribution of genes responsible for prezygotic barriers. (g3journal.org)
- Although we do not yet have direct evidence for the accumulation of ecological, behavioral, or fertilization prezygotic barrier genes on the X chromosome, faster-X evolution could make these barriers more likely to be X-linked. (g3journal.org)
- [7] All Y-linked genes are expressed and (apart from duplicated genes) hemizygous (present on only one chromosome) except in the cases of aneuploidy such as XYY syndrome or XXYY syndrome . (wikipedia.org)
- The Y chromosomes of humans and other mammals also contain other genes needed for normal sperm production. (wikipedia.org)
- Over time, genes that were beneficial for males and harmful to (or had no effect on) females either developed on the Y chromosome or were acquired through the process of translocation . (wikipedia.org)
- a researcher at the University of Minnesota College of Biological Sciences discovered that the linear arrangement of genes on a chromosome corresponds to the development of body segments in fruit flies ? (thefullwiki.org)
- The high-quality and large-insert BAC libraries of the insects, together with the identified BACs containing genes of interest, provide valuable information, resources and tools for comprehensive understanding and studies of the insect genomes and for addressing many fundamental questions in Lepidoptera. (biomedcentral.com)
- Because sex chromosomes contain different numbers of genes, different species of organisms have developed different mechanisms to cope with this inequality. (wikipedia.org)
- Thus, human females have the same number of expressed X-linked genes as do human males (XY), both sexes having essentially one X chromosome per cell, from which to transcribe and express genes. (wikipedia.org)
- Some lineages have evolved dosage compensation, an epigenetic mechanism which restores expression of X or Z specific genes in the heterogametic sex to the same levels observed in the ancestor prior to the evolution of the sex chromosome. (wikipedia.org)
- With our work, we were able to demonstrate that new sex chromosomes arise when existing genes like Mdmd move from the Y chromosome to another chromosome," Daniel Bopp says. (eurekalert.org)
- Resistance genes in wheat is the most effective and cost efficient way to control this insect. (usda.gov)
- Deletion bin mapping assigned these markers and genes to the distal 14% of chromosome arm 1AS, where another Hf-resistance gene Hdic (derived from emmer wheat) was also mapped previously. (usda.gov)
- Our results suggest that H9, H10, H11, Hdic, and the previously identified H9- or H11-linked genes may compose a cluster (or family) of Hf-resistance genes in the distal gene-rich region of wheat chromosome 1AS, and H10 most likely is the same gene as H9. (usda.gov)
- Wheat cultivar 'Seneca' was reported to carry Hessian fly resistance genes H7 on chromosome 5D and H8, which had an unknown chromosome location. (usda.gov)
- Phenotypic analyses showed at least two genes conditioning HF resistance in Seneca, but none of them was mapped on chromosome 5D as previously reported. (usda.gov)
- Conservation and de novo acquisition of dosage compensation on newly evolved sex chromosomes in Drosophila, Genes & Development , 27:853-858. (berkeley.edu)
- Creating the technology to produce transgenic insects has been a goal of insect molecular geneticists for years because of the great need to have effective tools to find, isolate and analyze insect genes and to genetically modify insects for the purposes of insect control. (biologists.org)
- any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and X and Y for the female and male sex chromosomes respectively. (dictionary.com)
- Kelly experienced changes in his gut microbiome, his cognitive abilities slowed down, certain genes would turn off and on, and his chromosome s experienced structural changes. (dictionary.com)
- In the nucleus, preferred positions are observed from chromosomes to single genes, in relation to normal and pathological cellular states. (europa.eu)
Species47
- Other ant species have more chromosomes. (wikipedia.org)
- This species can have more B chromosomes than A chromosomes at times, but 2n=4. (wikipedia.org)
- Broccoli , cabbage, kale , kohlrabi , brussels sprouts , and cauliflower are all the same species and have the same chromosome number. (wikipedia.org)
- Although some contradictory cases have been reported, the large homogeneity of the chromosome number 2n = 22 is now known for 135 (33.5%) distinct species among genus Eucalyptus . (wikipedia.org)
- All species in the genus Phaseolus have the same chromosome number, including common bean ( P. vulgaris ), runner bean ( P. coccineus ), tepary bean ( P. acutifolius ) and lima bean ( P. lunatus ). (wikipedia.org)
- On the other hand, species with genetic sex determination potentially benefit from an alternative option based on sex-chromosome differentiation: as Y chromosomes only occur in males, they may safely accumulate sexually antagonistic male-beneficial alleles without jeopardizing female fitness. (springer.com)
- Y chromosome function, structure and evolution is poorly understood in many species, including the Anopheles genus of mosquitoes-an emerging model system for studying speciation that also represents the major vectors of malaria. (genetics.org)
- Our results demonstrate that, despite their radically different structure, Y chromosomes of these two species of the gambiae complex that diverged an estimated 1.85 MYA function interchangeably, thus indicating that the Y chromosome does not harbor loci contributing to hybrid incompatibility. (genetics.org)
- We studied the occurrence of the TTAGG telomere repeats by fluorescence in-situ hybridization (FISH) and Southern hybridization in ten insect species and two other arthropods. (semanticscholar.org)
- Here we studied chromosome sets within a monophyletic group of previously non-karyotyped Polyommatus species. (spbu.ru)
- We demonstrate that these species have a limited interspecific chromosome number variation from n = 16 to n = 25, which is consistent with the Brownian motion model prediction. (spbu.ru)
- In some species, one of these lobes is of the harlequin type that differs from the other lobes by showing spermatogonial cells with meiotic pairing, nonspecific association of the autosomal bivalents, anomalous arrangement of the chromosomes in the metaphase plate, anomalous chromosome segregation, and cell fusion, resulting in the production of spermatozoa with highly variable chromosome numbers. (hindawi.com)
- Their discovery, "Chromosome Size in Diploid Eukaryotic Species Centers on the Average Length with a Conserved Boundary," was recently published in the journal Molecular Biology and Evolution. (k-state.edu)
- It details a project that compared 886 chromosomes in 68 random species of eukaryotes -- organisms whose cells contain a nucleus and are enclosed by cellular membranes. (k-state.edu)
- The researchers found that the chromosome sizes within each eukaryotic species are actually similar rather than drastically different as previously believed. (k-state.edu)
- Basically what this all means is that if the chromosome number of a species can be given, the relative sizes of all the chromosomes can instantly be known," Yu said. (k-state.edu)
- The sex chromosomes of each species were omitted because of their vastly different evolutionary history from other chromosomes, Yu said. (k-state.edu)
- It eliminated a scale effect and made it possible to compare a species with several dozen chromosomes to a species with much fewer chromosomes," said Xianran Li, research associate in agronomy. (k-state.edu)
- By finding normal distribution in nearly all of the genomes they used, geneticists can now say that if a species has a particular number of chromosomes, the chromosomes have to be distributed in this order because it's dictated by the laws of mitosis, meiosis and cell division, according to Guihua Bai, adjunct professor of agronomy at K-State and research geneticist of the U.S. Department of Agriculture-Agricultural Research Service. (k-state.edu)
- We report the chromosome-scale genome assembly of Callicarpa americana L. (American beautyberry), a species within the early-diverging Callicarpoideae clade of Lamiaceae, known for its metallic purple fruits and use as an insect repellent due to its production of terpenoids. (ufl.edu)
- Differentiating characteristics of the karyotype are 2n = 8, with polytene chromosomes combined in chromocentres of different degrees of stability, species-specific chromosome band sequences, and location of active regions. (bioone.org)
- The species is very polymorphous, with every chromosome arm having complex heterozygous inversions occurring in high frequency. (bioone.org)
- Chromosome rearrangements found in the species are discussed and the relation with other Xenochironomus species is proposed. (bioone.org)
- Species generally have a fixed number of chromosomes in the cell nuclei while between-species differences are common and often pronounced. (pubmedcentralcanada.ca)
- We show that within this species the diploid chromosome number gradually decreases from 2n = 106 in Spain to 2n = 56 in eastern Kazakhstan, resulting in a 6000 km-wide cline that originated recently (8,500 to 31,000 years ago). (pubmedcentralcanada.ca)
- Main karyotypic features of organisms, such as the number of chromosomes, are usually stable within species [ 1 , 2 ]. (pubmedcentralcanada.ca)
- At the same time, differences in karyotype characters between species, including diploid chromosome number (2n), are extremely common. (pubmedcentralcanada.ca)
- However, the spread of domestic T. infestans spreading and adaptation to domicilies observed in a tri- throughout the non-Andean regions only involved insects atomine species. (cdc.gov)
- Y is the sex-determining chromosome in many species , since it is the presence or absence of Y that determines the male or female sex of offspring produced in sexual reproduction . (wikipedia.org)
- Manduca sexta, Heliothis virescens , and Heliconius erato represent three widely-used insect model species for genomic and fundamental studies in Lepidoptera. (biomedcentral.com)
- Across species, different sexes are often characterized by different types and numbers of sex chromosomes. (wikipedia.org)
- Building on work done by Ohno and his colleagues, Lyon eventually proved that either the maternal or paternal X chromosome is randomly inactivated in every cell of the female body in the species she was studying, which explained the heterogeneous fur patterns she observed in her mosaic mice. (wikipedia.org)
- Each organism of a species is normally characterized by the same number of chromosomes in its somatic cells, 46 being the number normally present in humans, including 22 pairs of autosomes and the two sex chromosomes (XX or XY), which determine the sex of the organism. (thefreedictionary.com)
- Birds, some insects and a few other lizard species also rely on this sex-determination system. (scientificamerican.com)
- With Sally Hughes-Schrader at Columbia University in New York City he studied chromosomes in an aphid species in which the offspring of fertilized eggs develop into females. (isciii.es)
- Earwigs or Dermaptera constitute a comparatively small order of insects comprising about 1800 species. (tolweb.org)
- The chromatin landscape of Drosophila miranda: comparisons between species, sexes and chromosomes. (berkeley.edu)
- Sex-specific embryonic gene expression in species with newly evolved sex chromosomes. (berkeley.edu)
- To maintain a constant number of chromosomes in species the gamete cells undergo meiosis. (reference.com)
- Four antlion lacewings species and an owlfly one from two sister families have been studied and their chromosome number estimated: [1] Palpares libelluloides (2n = 26), [2] Distoleon tetragrammicus (2n. (eurekalert.org)
- Varying between organisms, the number of chromosomes, the structures of organised and packaged DNA information, are normally a constant amount, thus allowing for the successful reproduction of a species. (eurekalert.org)
- In the present study, conducted by Drs. Valentina Kuznetsova, Victor Krivokhatsky and Gadzhimurad Khabiev, Russian Academy of Sciences , four antlion lacewings species and an owlfly one from two sister families have been examined and their chromosome number estimated. (eurekalert.org)
- The chromosome numbers of four antlion species (Myrmeleontidae) and an owlfly one (Ascalaphidae) from the Republic of Dagestan have been investigated in the Zoological Institute, Russian Academy of Sciences , St. Petersburg. (eurekalert.org)
- While most antlions possess lower chromosome numbers, 2n = 14 and 2n = 16, which are encountered in all subfamilies, there is the exception of the Palparinae subfamily with the studied Palpares libelluloides species' chromosome number counting 2n = 26. (eurekalert.org)
- Instability, particularly if it is unpredictable, increases the uncertainty associated with describing accurately the phenotype of the insect and any attempt to model the behavior of a transgene over time in the genetically modified species. (biologists.org)
- In plants, for instance, plant chemistry, insect associations, and number of chromosomes may be important indicators of species status. (encyclopedia.com)
- Some species have male or female heterogametic sex chromosomes while other species do not have sex chromosomes. (mdpi.com)
Homologous Chromosomes3
- Uniparental disomy is the inheritance of two homologous chromosomes from one parent. (thefullwiki.org)
- The term monosomy refers to the absence of one of a pair of homologous chromosomes. (thefreedictionary.com)
- A single chromosome set consists of two chromosomes, one of which is donated from the mother and the other from the father.Humans have 23 sets of homologous chromosomes. (reference.com)
Genomes6
- According to Yu, the most surprising finding is the extremely consistent distribution pattern of the chromosomes, a result from comparing the full sets of chromosomes -- called genomes -- of the 68 random eukaryotes. (k-state.edu)
- From there the team looked specifically at the chromosomes of 68 random eukaryote genomes. (k-state.edu)
- This volume focuses on the latest methods used to sequence, assemble, and analyze insect genomes. (springer.com)
- bioinformatics analysis of epigenetic modifications, high-throughput scanning of insect genomes (TEEseq) for the presence of endosymbionts, and leveraging genome sequence information to design RNAi strategies. (springer.com)
- The sample of the genomic sequences provides the first insight into the constitution and evolution of the insect genomes. (biomedcentral.com)
- A wide range of genomes are considered including those of bacteria, yeast, insects and humans. (le.ac.uk)
Drosophila11
- Interchromosomal duplications on the Bactrocera oleae Y chromosome imply a distinct evolutionary origin of the sex chromosomes compared to Drosophila. (biomedsearch.com)
- However, basic genome research on this insect is still far behind compared with other model organisms such as Drosophila melanogaster , and assignment of fundamental information such as genome sequences, ESTs, BAC contigs, mutant phenotypes, and chromosomal locations on detailed linkage maps is an urgent priority. (genetics.org)
- The genome-wide multi-layered architecture of chromosome pairing in early Drosophila embryos. (harvard.edu)
- this is called X-inactivation), a two-fold increase in the transcription of a single male X chromosome (as observed in Drosophila melanogaster), and decreased transcription by half in both of the X chromosomes of a hermaphroditic organism (as observed in Caenorhabditis elegans). (wikipedia.org)
- The epigenome of evolving Drosophila neo-sex chromosomes: dosage compensation and heterochromatin formation, PLoS Biology , 11:e1000711. (berkeley.edu)
- Reversal of an ancient sex chromosome to an autosome in Drosophila. (berkeley.edu)
- 43. Zhou Q & Bachtrog D (2012) Sex-specific adaptation drives early sex chromosome evolution in Drosophila. (berkeley.edu)
- 40. Zhou Q & Bachtrog D (2012) Chromosome-wide gene silencing initiates Y degeneration in Drosophila. (berkeley.edu)
- Insects such as Drosophila melanogaster undergo a derived form of segmentation termed long germband segmentation. (biologists.org)
- Although we know much about Drosophila segmentation, we still know very little about how the blastoderm of short and intermediate germband insects is allocated into only the anterior segments, and how the remaining posterior segments are produced. (biologists.org)
- In order to gain insight into this type of embryogenesis, we have investigated the expression and function of the homolog of the Drosophila gap gene hunchback in an intermediate germ insect, the milkweed bug, Oncopeltus fasciatus . (biologists.org)
Autosomes6
- The patterns of gene expression on highly differentiated sex chromosomes differ drastically from those on autosomes, due to sex-specific patterns of selection and inheritance. (springer.com)
- The Y chromosome is strewn with repetitive DNA sequences, the majority of which are also interdispersed in the pericentromeric regions of the autosomes. (biomedsearch.com)
- This amounted to observing 886 chromosomes, 22 of which were human autosomes -- any chromosome other than a sex chromosome. (k-state.edu)
- These analyses are fundamental in the design of control specimens present C-heterochromatic blocks in most of campaigns because their results will help determine the their 22 chromosomes, whereas non-Andean specimens have only 4-7 autosomes with C-banding. (cdc.gov)
- pairs of autosomes and 1 pair of sex chromosomes (XY in Institut de Recherche pour le Développement, Montpellier, males, XX in females) (8). (cdc.gov)
- The X and Y chromosomes are thought to have evolved from a pair of identical chromosomes, [14] [15] termed autosomes , when an ancestral animal developed an allelic variation, a so-called "sex locus" - simply possessing this allele caused the organism to be male. (wikipedia.org)
Genetic12
- We sample a population of common frogs ( Rana temporaria ) with limited sex-chromosome differentiation (proto-sex chromosome), leaky genetic sex determination evidenced by the occurrence of XX males, and delayed gonadal development, meaning that XY individuals may first develop ovaries before switching to testes. (springer.com)
- So, all the cells in our body carry the same genetic material (chromosomes), apart from a few exceptions such as gametes, antibody-producing cells, and also, unfortunately, tumor cells. (innovations-report.com)
- In meiosis (from the Greek, meaning reduction), unlike mitosis, the genetic material is halved when transmitted from the mother cell to the daughter cells: 2n chromosomes (diploid cell) become n chromosomes (haploid cell). (innovations-report.com)
- Our results demonstrate how a complex interplay between sex, colour pattern, male-killing, and a neo-W chromosome, has set up a genetic 'sink' that keeps the two subspecies apart. (royalsocietypublishing.org)
- Lines to the right of chromosomes represent BACs shown by FISH to bind in relative order and positions predicted from the genetic and physical maps. (nih.gov)
- Because chromosomes are the genetic building blocks for an organism and its traits, the information will be beneficial to understanding the core components of biological evolution -- especially in genetics and genome evolution, said Jianming Yu, associate professor of agronomy at K-State. (k-state.edu)
- in 1902, the Boveri-Sutton Chromosome Theory unified the genetic laws of Mendelian inheritance with the physical structures of chromosomes observed in cells? (thefullwiki.org)
- Pallister-Killian syndrome is a rare congenital genetic disorder that cannot be detected through prenatal blood tests because it occurs only in the chromosomes of skin cells ? (thefullwiki.org)
- microchromosomes are very tiny gene -rich chromosomes which are a typical genetic component in birds , and some groups of non-mammalian animals? (thefullwiki.org)
- Ris' favorite comparisons of genetic material were of the chromosomes, nuclear membranes and cytoskeleton of eggs and sperm cells of animals including sea urchins, frogs, toads and salamanders. (isciii.es)
- University Lecturer/Research Scientist who uses insects to model human genetic disease (eg Down's Syndrome, Cancer). (expertguide.com.au)
- In: Lukhtanov VA, Kuznetsova VG, Grozeva S, Golub NV (Eds) Genetic and cytogenetic structure of biological diversity in insects. (eurekalert.org)
Segregation4
- We hypothesise that the ability to invert the order of the meiotic events may be adaptive and can facilitate proper chromosome segregation in chromosomal heterozygotes, thus promoting rapid karyotype evolution. (spbu.ru)
- We demonstrate that the majority of CI-induced mortality occurs during embryogenesis and that the pattern of paternal chromosome segregation during the first mitosis is a good predictor of CI phenotype. (biologists.org)
- The latter class is the first documented example of asymmetric mitotic segregation of abnormal chromosomes. (biologists.org)
- Accurate chromosome segregation is only possible because monumental topological problems posed by the sheer size and physical properties of DNA are overcome by highly conserved DNA motors, namely condensin and cohesin. (elifesciences.org)
Evolutionary8
- Evolutionary insights into the genomic organization of major ribosomal DNA in ant chromosomes. (bvsalud.org)
- Characterization of Y sequences, apart from elucidating the nature of the male determining factor, is also important to understand the evolutionary history of sex chromosomes within the Tephritidae. (biomedsearch.com)
- We hypothesize how these repetitive sequences accumulated and were maintained on the Y chromosome during its evolutionary history. (biomedsearch.com)
- Our data reinforce the idea that the sex chromosomes of the Tephritidae may have distinct evolutionary origins with respect to those of the Drosophilidae and other Dipteran families. (biomedsearch.com)
- In order to neutralize the large difference in gene dosage produced by differing numbers of sex chromosomes among the sexes, various evolutionary branches have acquired various methods to equalize gene expression among the sexes. (wikipedia.org)
- This chromosome has apparently assumed a prime role in sex determination only recently from an evolutionary viewpoint. (eurekalert.org)
- Sex Chromosomes Demonstrate Complex Evolutionary Trajectories Across Bird Taxa. (berkeley.edu)
- Comparative sex chromosome genomics in snakes: differentiation, evolutionary strata, and lack of global dosage compensation. (berkeley.edu)
Molecular7
- SEX chromosomes often play an important role in speciation, though the molecular factors that influence this process remains an area of active investigation ( Ellegren 2011 ). (genetics.org)
- Apart from these importin-4-like sequences, the other Y repetitive sequences are not shared with the X chromosome, suggesting molecular differentiation of these two chromosomes. (biomedsearch.com)
- Molecular Biology of Insect Disease Vectors: A Methods Manual , ed. (ajtmh.org)
- Korenberg J. R. & Rykowski, M. C. Human genome organization: Alu, lines, and the molecular structure of metaphase chromosome bands. (thefullwiki.org)
- Large-insert BAC libraries of these insects are critical resources for many molecular studies, including physical mapping and genome sequencing, but not available to date. (biomedcentral.com)
- In a Tufts University study published in the Aug. 3 journal "Molecular Cell," two molecular biologists have used yeast artificial chromosomes to prove the hypothesis. (bio-medicine.org)
- In a study published last month, researchers at the Massachusetts Institute of Technology tracked an important part of the memory-making process at the molecular scale in engram cells' chromosome s. (dictionary.com)
Human chromosomes5
- High-resolution, 3D images of human chromosomes in single cells reveal how DNA structure might influence its function. (innovations-report.com)
- In high school textbooks, human chromosomes are pictured as wonky Xs like two hotdogs jammed together. (innovations-report.com)
- Last year, before Su graduated with his Ph.D., he and three current Ph.D. candidates in the Graduate School of Arts and Sciences-Pu Zheng, Seon Kinrot and Bogdan Bintu-captured high-resolution 3D images of human chromosomes, the complex houses for our DNA. (innovations-report.com)
- 2002. Genomic Structure and Evolution of the Ancestral Chromosome Fusion Site in 2q13-2q14.1 and Paralogous Regions on Other Human Chromosomes. (icr.org)
- MEDFORD/SOMERVILLE, Mass. In the past ten years, researchers in genome stability have observed that many kinds of cancer are associated with areas where human chromosomes break. (bio-medicine.org)
Organism2
- The number of exchanges will vary from one organism or chromosome to another (on average, one to five per chromosome, and up to one hundred or so per cell). (innovations-report.com)
- If the diploid number in a liver cell is 52, how many chromosomes are there in the egg of this organism? (reference.com)
Chromatin6
- To do that, cells divide and replicate their DNA, which is wrapped into labyrinthine libraries inside chromatin, the stuff inside chromosomes. (innovations-report.com)
- With this technique, the team imaged about 2,000 chromatin loci per cell, a more than ten-fold increase from their previous work and enough to form a high-resolution image of what the structure of chromosomes looks like in its native habitat. (innovations-report.com)
- In N. giraulti and N. longicornis , the paternal chromosomes mis-segregate, producing abnormal nuclei connected by chromatin bridges. (biologists.org)
- Nucleolar expansion due to abnormal increases in polyamines could disrupt nearby chromatin, such as the inactive X chromosome, leading to expression of previously sequestered DNA. (frontiersin.org)
- In the hypothesis it was proposed that enlargement of the nucleolus in response to cellular stress could disrupt neighboring chromatin, such as the inactive X chromosome. (frontiersin.org)
- Chromatin The network of chromosomes, histones, and other proteins found in the eukaryotic nucleus during interphase. (thefullwiki.org)
Genetically3
- Here, we used an F1 × F0 crossing scheme to overcome a severe bottleneck of male hybrid incompatibilities that enabled us to experimentally purify a genetically labeled A. gambiae Y chromosome in an A. arabiensis background. (genetics.org)
- Swarms of insects, transporting genetically modified infectious viruses, attack the agricultural crops of a country and destroy its food production - this is not a science-fiction scenario, but a plan that is actually being prepared by DARPA, the Pentagon's Defense Advanced Research Projects Agency. (fourwinds10.com)
- In their editorial, published on 5 October, they cast serious doubt on the idea that DARPA's research, entitled "insect allies" was intended only for the use declared by the Agency - the protection of US agriculture against pathogens by using insects as the vectors of genetically modified infectious viruses. (fourwinds10.com)
Sequences7
- Comparative FISH-mapping of TTAGG telomeric sequences to the chromosomes of leafcutter ants (Formicidae, Myrmicinae): is the insect canonical sequence conserved? (semanticscholar.org)
- Moreover, as the identified Y sequences were not detected on the Y chromosomes of closely related tephritids, we can infer divergence in the repetitive nature of their sequence contents. (biomedsearch.com)
- CONCLUSIONS/SIGNIFICANCE: The identification of Y-linked sequences may tell us much about the repetitive nature, the origin and the evolution of Y chromosomes. (biomedsearch.com)
- A second-generation linkage map was constructed for the silkworm, Bombyx mori , focusing on mapping Bombyx sequences appearing in public nucleotide databases and bacterial artificial chromosome (BAC) contigs. (genetics.org)
- Birds are unique because in addition to their usual chromosome sequences, they contain one additional set of minichromosome sequences, according to Zhongwei Lin, research associate in agronomy. (k-state.edu)
- Find this article online O'Keefe RT, Henderson SC, Spector DL (1992) Dynamic organization of DNA replication in mammalian cell nuclei: Spatially and temporally defined replication of chromosome-specific alpha-satellite DNA sequences. (thefullwiki.org)
- The scientists were especially interested in their telomeres-protective DNA sequences at the ends of chromosome s that act a bit like the caps on the ends of shoelaces. (dictionary.com)
Autosome2
- Here we show that a neo-W chromosome, a fusion between the W (female) chromosome and an autosome that controls both colour pattern and male-killing, links the two phenotypes thereby driving speciation across the hybrid zone. (royalsocietypublishing.org)
- Furthermore, the subset of those highly differentiated markers that exhibit restricted introgression across the cricket hybrid zone are also concentrated on the X chromosome (39 of 50 loci) and in a single 7-cM region of one autosome. (g3journal.org)
Pair of sex chromosomes1
- Most mammals have only one pair of sex chromosomes in each cell. (wikipedia.org)
Mitosis5
- All chromosomes normally appear as an amorphous blob under the microscope and only take on a well-defined shape during mitosis . (wikipedia.org)
- It is entirely coincidental that the Y chromosome, during mitosis , has two very short branches which can look merged under the microscope and appear as the descender of a Y-shape. (wikipedia.org)
- During the mitosis (M) phase, the duplicated chromosomes are segregated, migrating to opposite poles of the cell. (encyclopedia.com)
- The final key checkpoint occurs at the end of mitosis, when the cycle stops if chromosomes are not properly attached to the mitotic spindle. (encyclopedia.com)
- During mitosis, DNA is condensed into visible chromosomes (prophase) that arrange at the cell midplane (metaphase), separate (anaphase), and decondense into the interphase. (thefullwiki.org)
Evolution14
- The proto-sex chromosome of common frogs does not show evidence of sexualization of gene expression, nor evidence for a faster rate of evolution. (springer.com)
- In addition, Dr. Bergman's and my recent study on human telomeres related to chromosomes, evolution, and intelligent design is now in print in the April 2011 Journal of Creation . (icr.org)
- Sexually antagonistic selection can drive both the evolution of sex chromosomes and speciation itself. (royalsocietypublishing.org)
- Although this mechanism of chromosome number evolution is possible in theory, it has not been well documented. (pubmedcentralcanada.ca)
- The discovered system represents the first clearly documented case of explosive chromosome number evolution through intraspecific and intrapopulation accumulation of multiple chromosomal changes. (pubmedcentralcanada.ca)
- Sex determination, sex chromosomes and karyotype evolution in insects, submitted. (berkeley.edu)
- Transposons drive sex chromosome evolution. (berkeley.edu)
- Sex-biased gene expression at homomorphic sex chromosomes in emus, and its implication for sex chromosome evolution. (berkeley.edu)
- Y chromosome evolution: emerging insights into processes of Y degeneration. (berkeley.edu)
- 42. Bachtrog D (2013) Evolution of sex chromosomes. (berkeley.edu)
- Camacho JPM: B chromosomes, in Gregory TR (ed): The Evolution of the Genome, pp 223-286 (Elsevier, San Diego 2005). (karger.com)
- Evolution (af latin e = "ud" + volvere = rulle, altså "udrulning" eller udvikling) er en proces hvorved sammensætningen af arveanlæg i en population ændres over generationer. (wikipedia.org)
- Darwin var den første der beskrev evolution som en proces drevet af naturlig udvælgelse , og dermed den første til at give en videnskabelig forklaring på de processer der fører til artsdannelse. (wikipedia.org)
- På molekylært niveau defineres evolution som enhver proces der fører til at frekvensen af en bestemt genetisk variant ændres i en given befolkning af organismer. (wikipedia.org)
Cell nuclei1
- In humans, women have two X chromosomes in the cell nuclei, while men have an X and a Y chromosome. (eurekalert.org)
Polytene chromosomes1
- Polytene chromosomes from an insect. (gettyimages.com.au)
Chromatids3
- Split into two chromatids, the chromosomes form homologous pairs, one inherited from the father and the other from the mother. (innovations-report.com)
- The chromatids (half-chromosomes) of the large X chromosomes do not separate from each other in the first meiotic cell division in the testes. (isciii.es)
- The entire whole X chromosome, with both chromatids still attached to each other at the kinetochore, stretches along the axis of the spindle fibers, parallel to them. (isciii.es)
Sets of chromosomes2
- A diploid cell is a cell that contains two sets of chromosomes.This is double the haploid chromosome number. (reference.com)
- However, in 2004, experimental manipulation by Japanese researchers of a paternal methylation imprint controlling the Igf2 gene led to the birth of a mouse (named Kaguya) with two maternal sets of chromosomes, though it is not a true parthenogenone since cells from two different female mice were used. (wikipedia.org)
Vectors2
- The post-integration behavior of existing insect vectors has not been extensively examined. (biologists.org)
- The post-integration behavior of insect gene vectors is particularly relevant to a number of future applications of this technology. (biologists.org)
Females13
- Males have XY sex chromosomes and females have XX sex chromosomes. (wikipedia.org)
- The sex chromosomes are the largest chromosomes and constitute 30% of the total length of the diploid set in females and about 25% in males. (wikipedia.org)
- In proto-sex chromosomes (where X and Y chromosomes differ only at the sex-determining locus), male-beneficial mutations on the Y may spread even if detrimental to females, because linkage with the sex-determining locus makes them more likely to be transmitted to sons than to daughters. (springer.com)
- The most common Wolbachia -induced phenotype in insects is cytoplasmic incompatibility (CI), which occurs when sperm from infected males fertilize eggs from uninfected females. (biologists.org)
- Males have one Y chromosome and one X chromosome , while females have two X chromosomes. (wikipedia.org)
- For example, in humans, females (XX) silence the transcription of one X chromosome of each pair, and transcribe all information from the other, expressed X chromosome. (wikipedia.org)
- One logical way to equalize gene expression amongst males and females that follow a XX/XY sex differentiation scheme would be to decrease or altogether eliminate the expression of one of the X chromosomes in an XX, or female, homogametic individual, such that both males and females then express only one X chromosome. (wikipedia.org)
- Ohno's studies of Barr bodies in female mammals with multiple X chromosomes revealed that such females used Barr bodies to inactivate all but one of their X chromosomes. (wikipedia.org)
- Although we think of females being XX (that is, having two X chromosomes) and males as being XY, it's the other way around in these giant monitor lizards. (scientificamerican.com)
- In northern latitudes, females have X chromosomes, while males have an X and a Y chromosome. (eurekalert.org)
- When specially bred, sterile insect males are released, they compete with the wild males for the females. (eurekalert.org)
- In females, all chromosomes remain euchromatic and functional. (wikipedia.org)
- We analyzed the effect of B-chromosome presence on expression level of heat shock protein 70 (Hsp70) in cerebral ganglion and gonad in both males and females of the grasshopper Eyprepocnemis plorans . (karger.com)
Wolbachia3
- The members of the genus Wolbachia are rickettsial endosymbitic bacteria belonging to the α- Proteobacteria , whose infections are prevalent among arthropods, including over 60 per cent of insects and some filarial nematodes. (royalsocietypublishing.org)
- Some medical and hygienic pest insects, such as tsetse flies and mosquitoes, which vector devastating human pathogens, often also carry Wolbachia infections. (royalsocietypublishing.org)
- In this context, Wolbachia infections in pest insects are potentially of practical utility. (royalsocietypublishing.org)
Ancestral4
- Fusion of ancestral chromosomes left distinctive remnants of telomeres , and a vestigial centromere . (wikipedia.org)
- Previous analyses have shown that these numbers most likely evolved gradually from an ancestral karyotype, in accordance with the Brownian motion model of chromosome change accumulation. (spbu.ru)
- Since Palparinae lacewings represent one of basal phylogenetic lineage of the Myrmeleontidae, it is hypothesized that higher chromosome numbers are ancestral for antlions. (eurekalert.org)
- As short and intermediate germ segmentation is found throughout the insects, whereas the long germ type is restricted to the higher insects, it is likely that a form of short or intermediate germband segmentation is evolutionarily ancestral ( Davis and Patel, 2002 ). (biologists.org)
Acrocentric chromosomes2
- The diploid chromosome number is 2n = 14 with four pair of long acrocentric chromosomes ranging from 14.4 μm to 17.9 μm and three pair of short sub metacentric chromosomes ranging from 4.6 μm to 5.4 μm. (wikipedia.org)
- Organization of centromeric-proximal telomeres on the short arm of the 15 acrocentric chromosomes in Apis is hypothetical based on FISH studies. (nih.gov)
Holocentric chromosomes2
- The Polyommatus butterflies have holocentric chromosomes, which are characterized by kinetic activity distributed along the entire chromosome length, and the highest range of haploid chromosome numbers (n) known within a single eukaryotic genus (from n = 10 to n = 226). (spbu.ru)
- High dynamics of rDNA cluster location in kissing bug holocentric chromosomes (Triatominae, Heteroptera). (semanticscholar.org)
Fluorescence in situ hybri2
- Characterization of honeybee (Apis mellifera L.) chromosomes using repetitive DNA probes and fluorescence in situ hybridization. (semanticscholar.org)
- METHODOLOGY/PRINCIPAL FINDINGS: A combined Representational Difference Analysis (RDA) and fluorescence in-situ hybridization (FISH) approach was used to investigate the Y chromosome to derive information on its sequence content. (biomedsearch.com)
Diploid cell2
- Germ cells have only half the number of chromosomes as a diploid cell one of each pair - and are termed haploid (n). (reference.com)
- Each pair of chromosomes in a diploid cell is considered to be one homologous chromosome set. (reference.com)
Telomeres1
- Scientists at Johns Hopkins say they have found that people born with abnormally short chromosome endcaps, or telomeres, have immune system cells that age and die prematurely. (news-medical.net)
Proto-sex chromosome2
- and is not localized to the proto-sex chromosome nor near the candidate sex-determining gene Dmrt1 . (springer.com)
- In the case of houseflies from southern latitudes, the gene that determines maleness lies on a so-called proto-sex chromosome. (eurekalert.org)
Eukaryotes1
- Chromosomes of higher organisms ( eukaryotes ) contain DNA and protein. (thefullwiki.org)
Arthropods1
- This is a collection of Terminology, Entomological and Arthropodal (See Insects or Arthropods ) in nature. (earthlife.net)
Sequence5
- Y chromosome sequence content in heterogametic animals is transmitted in a clonal manner due to the lack of crossing over with the X across some or all of its length. (genetics.org)
- Identification of a pentanucleotide telomeric sequence, (TTAGG)n, in the silkworm Bombyx mori and in other insects. (semanticscholar.org)
- [11] Platypus sex chromosomes have strong sequence similarity with the avian Z chromosome , (indicating close homology ), [12] and the SRY gene so central to sex-determination in most other mammals is apparently not involved in platypus sex-determination. (wikipedia.org)
- Sequence Expression of Supernumerary B Chromosomes: Function or Fluff? (mdpi.com)
- The Tufts researchers have found a highly flexible DNA sequence that increases fragility and stalls replication, which then causes the chromosome to break. (bio-medicine.org)
Hybridization1
- Gene Mapping to Chromosomes by Hybridization in Situ. (barnesandnoble.com)
Embryonic3
- According to the observation of embryonic cells of egg, chromosome number of the itch mite is either 17 or 18. (wikipedia.org)
- In mammals, the Y chromosome contains a gene, SRY , which triggers embryonic development as a male. (wikipedia.org)
- A condition known as mosaicism results from an error in the distribution of chromosomes between daughter cells during an early embryonic cell division, producing two and sometimes three populations of cells with different chromosome numbers in the same individual. (thefreedictionary.com)
Defects2
- The sex chromosomes are labeled X and Y. Karyotyping is useful in determining the presence of chromosome defects. (thefreedictionary.com)
- Many of the sexual aberrations, such as sexual mosaics, sex-specific lethality and conversion of sexuality, can be explained by developmental defects including double fertilization of a binucleate egg, loss of a sex chromosome or perturbation of sex-determining gene expression, which occur accidentally or are induced by certain environmental conditions. (mdpi.com)
Mitotic1
- In some aspects, e.g. meiotic behaviour and mitotic instability leading to individual mosaicism (in the case of mitotically unstable Bs), polysomic As show similar characteristics to B chromosomes. (karger.com)
Metaphase1
- Diagram of a duplicated and condensed metaphase eukaryotic chromosome. (thefullwiki.org)
Gene expression2
- However, it is not known how quickly sexualization of gene expression and transcriptional degeneration evolve after sex-chromosome formation. (springer.com)
- and insect basic leucine zipper proteins and their role in cyclic AMP dependent regulation of gene expression. (google.com)
Mammals4
- The Y chromosome is one of two sex chromosomes ( allosomes ) in mammals , including humans , and many other animals. (wikipedia.org)
- In mammals, the Y chromosome contains the gene SRY , which triggers testis development. (wikipedia.org)
- In this chapter it is used for insects (v. 21), various small mammals and reptiles (vv. (icr.org)
- We implement extensive research projects covering not only mammals but also invertebrates such as insects, in fields ranging from regenerative medicine of the pancreas and liver to the development of novel methods of insect pest control. (kit.ac.jp)
Genomics2
- Genomics: how to make a social insect. (nih.gov)
- Cutting-edge and thorough, Insect Genomics: Methods and Protocols is a valuable resource for graduate students, postdocs, and novice research scientists who are interested in learning more about this developing field. (springer.com)
Bacterial artificial1
- A bacterial artificial chromosome (BAC)-based approach for integration of genome information has a definite advantage for facilitating further functional analysis. (genetics.org)
Paternal1
- Each pair of chromosomes - one of paternal origin, the other maternal - is positioned independently of the other pairs on the equatorial plate, before migrating to the poles to produce two daughter cells. (innovations-report.com)
Polymorphism3
- Polysomy for A chromosomes and B chromosomes are two kinds of chromosome polymorphism frequently found in grasshoppers. (karger.com)
- Remarkably, intrapopulational chromosome number polymorphism exists, the chromosome number range overlaps between some populations separated by hundreds of kilometers, and chromosomal heterozygotes are abundant. (pubmedcentralcanada.ca)
- Marker polymorphism results indicated that a small terminal segment of chromosome 1AS containing H9 or H10 was transferred from the donor parent to the wheat line Iris or Joy, and a small intercalary fragment carrying H11 was transferred from the resistant donor to the wheat line Karen. (usda.gov)
Heterochromatin1
- The ideogram (in blue) shows average chromosome lengths, positions and sizes of DAPI-positive (heterochromatin) bands. (nih.gov)
Populations1
- Two natural Spanish populations, Salobreña (Granada) and Torrox (Málaga) were assayed, the former harbouring a neutralized (non-driving) B-chromosome (B 2 ) and the latter a parasitic (driving) B-chromosome (B 24 ). (karger.com)
Interactions3
- Moreover, they provide direct evidence for long-range chromosome interactions and their impact on three-dimensional nuclear architecture, while providing a cohesive explanation for the phenomenon of PEV. (nih.gov)
- Although his research focused on the ecology of insects and insect-plant interactions, he also has an interest in insect histology. (wiley.com)
- Interactions between endosymbionts and insects are widespread in nature [ 1 , 2 ], and are particularly important in members of the suborder Sternorrhyncha such as whiteflies, aphids, psyllids and mealybugs. (biomedcentral.com)
Cytogenetic2
- Cytogenetic markers reveal a reinforcement of variation in the tension zone between chromosome races in the brachypterous grasshopper Podisma sapporensis Shir. (nature.com)
- Cytogenetic disorders with visible chromosomal abnormalities are evidenced by either an abnormal number of chromosomes or some alteration in the structure of one or more chromosomes. (thefreedictionary.com)
Recombination5
- The recombination of chromosomes: a controlled game of love and chance? (innovations-report.com)
- Home / Life Sciences / The recombination of chromosomes: a controlled game of love and chance? (innovations-report.com)
- This discovery, published in the October 18, 2002 issue of Cell, has led to the development of a method, for which a patent application has been made, which henceforth allows scientists to stimulate and "target" in vivo recombination at specific sites on the chromosomes, near one or other gene. (innovations-report.com)
- Chromosome end elongation by recombination in the mosquito Anopheles gambiae. (semanticscholar.org)
- Bell G, Burt A: B chromosomes: germ-line parasites which induce changes in host recombination. (karger.com)
Centromere1
- Until one centromere becomes inactivated the new chromosome will have two active centromeres (dicentric). (thefullwiki.org)
Higher chromosome2
- D. capillifolius , D. sahariensis and D. syrticus are the other members of the genus with 2n = 18, whereas D. muricatus (2n = 20) and D. pusillus (2n = 22) have a slightly higher chromosome number. (wikipedia.org)
- The higher chromosome numbers were inherited from the common ancestor of Myrmeleontidae + Ascalaphidae. (eurekalert.org)
Journal of Insect Science1
- Journal of Insect Science. (wikipedia.org)
Sexes1
- Different lineages have evolved different mechanisms to cope with the differences in gene copy numbers between the sexes that are observed on sex chromosomes. (wikipedia.org)
Hemiptera1
- This disease is caused by the flagellate proto- ly in domestic and peridomestic environments, occupying zoan Trypanosoma cruzi, and it is transmitted by blood- cracks and crevices in rural dwellings and domestic animal sucking insects of the subfamily Triatominae (Hemiptera, enclosures. (cdc.gov)
Telomeric repeats2
- Phylogenetic distribution of TTAGG telomeric repeats in insects. (semanticscholar.org)
- however, some chromosome ends lacked signals, probably due to a low number of telomeric repeats. (nature.com)
Determination3
- While the cause for the disparate numbers is unknown, it may arise because of an XO sex determination mechanism , where males (2n=17) lack the sex chromosome and therefore have one less chromosome than the female (2n=18). (wikipedia.org)
- She realized that the previous idea of Clarence Erwin McClung , that the X chromosome determines sex, was wrong and that sex determination is, in fact, due to the presence or absence of the Y chromosome. (wikipedia.org)
- For example, the platypus relies on an XY sex-determination system based on five pairs of chromosomes. (wikipedia.org)
Pest2
Male sex2
- The Y chromosome carries the SRY gene, which determines the male sex. (eurekalert.org)
- After the change of location, the Y chromosome is lost and the new sex chromosome with the Mdmd gene assumes the function of determining the male sex. (eurekalert.org)
Meiosis4
- For Polyommatus poseidonides we report the phenomenon of flexible meiosis in which the chromosome multivalents are able to undergo either conventional or inverted meiosis within the same individual. (spbu.ru)
- By study of spermatogenesis in these and other spermatocytes, Ris established that the normal, if unusual, cycle of events in chromosomes in this modified male meiosis determines the life history of these aphids. (isciii.es)
- These gametes are produced by meiosis, which halves the number of chromosomes in the diploid germ cells. (reference.com)
- Meiosis is the reduction division because it reduces the number of chromosome. (reference.com)
Spermatocytes1
- In the males (which are XO), spermatocytes contain one oversized X chromosome and cell division is very unequal. (isciii.es)
Mechanisms2
- In fact, polysomy is regarded as one of the main mechanisms for B chromosome origin. (karger.com)
- Many different sex-determining mechanisms prevail among insects. (eurekalert.org)