Eutherian ancestral chromosomes paint your chromosomes. Medical search. Frequent questions

The probes have been used for molecular hybridizations (fluorescence in situ hybridization, or FISH) in clinical cytogenetics, Y chromosome mapping, sequencing, gene discovery, and comparative Y chromosome studies between the horse and other equids/ Perssodactyls. (veteriankey.com)
The future of molecular cytogenetics is likely to depend on a better knowledge of chromosome structure and function. (biomedcentral.com)
Cyril Darlington pioneered plant cytogenetics in 1920-30 and made important advances in our understanding of mechanisms of chiasma formation and the behavior of sex chromosomes in meiosis [ 7 ]. (biomedcentral.com)
One of the purposes of this review is to encourage research into chromosome structure as this could help advance molecular cytogenetics. (biomedcentral.com)

The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms. (wikipedia.org)
Since the genetic code was deciphered much has been learnt about the chromosome structure shared by all organisms from yeast to human. (biomedcentral.com)

It shows 22 homologous autosomal chromosome pairs, both the female (XX) and male (XY) versions of the two sex chromosomes, as well as the mitochondrial genome (at bottom left). (wikipedia.org)

Fusion of ancestral chromosomes left distinctive remnants of telomeres, and a vestigial centromere. (wikipedia.org)
We now recognize that, following DNA replication, the metaphase chromosome consists of two chromatids held together by a centromere and by cohesin. (biomedcentral.com)

Phylogenomic studies using chromosome painting confirms the high conservation of DNA between even distantly related species [ 13 ]. (biomedcentral.com)

As other non-human extant hominidae have 48 chromosomes it is believed that the human chromosome 2 is the result of the merging of two chromosomes. (wikipedia.org)
Additionally, there are two reports about infertile stallions having XXY sex chromosomes - an equine counterpart to human Kleinfelter syndrome (Kubien et al. (veteriankey.com)

This polymorphism is primarily attributed to the various amount of Y heterochromatin, though earlier studies also suggest variation in the euchromatic portion of the chromosome (Power, 1988). (veteriankey.com)
Morgan, Sturtevant, Bridges and Muller constructed the first genetic linkage maps from recombination studies in crosses made in the fruit fly and from cytological preparations of its polytene salivary gland chromosomes [ 4 - 6 ]. (biomedcentral.com)
These studies reaffirmed that chromosome structure and behavior in somatic and germ cell divisions were common to all plants and animals. (biomedcentral.com)

An important breakthrough in horse Y chromosome research came with the availability of new genomics tools and resources, such as large-insert genomic bacterial artificial chromosome (BAC) libraries (for review, see Rubes et al. (veteriankey.com)
The review provides a brief account of the structure of somatic and meiotic chromosomes, stressing the high conservation of structure in plants and animals, with emphasis on aspects that require further research. (biomedcentral.com)

This might be because rearrangements in the gene-poor Y chromosome have milder effect on the phenotype, as a result of which the affected individuals escape attention and are not subjected to cytogenetic analysis. (veteriankey.com)

Improvements in the resolution of chromosome analysis has followed closely the introduction of innovative technology. (biomedcentral.com)

This number, along with the visual appearance of the chromosome, is known as the karyotype, and can be found by looking at the chromosomes through a microscope. (wikipedia.org)
Furthermore, in a wider perspective, we have revised previous cytogenomic literature data on chromosome 13 evolution in eutherian mammals, showing a complex origin of the eutherian mammal ancestral karyotype which has still not been completely clarified. (nih.gov)
We propose a possible ancestral karyotype of the tribe and, based on it, traced the features of chromosomal rearrangements accompanying the divergence of moles. (bvsalud.org)
We found that the karyotypes of Sciuridae and Leporidae are highly conserved and close to the Rodentia ancestral karyotype, while Castoridae chromosomes underwent many more changes. (bvsalud.org)

It shows 22 homologous autosomal chromosome pairs, both the female (XX) and male (XY) versions of the two sex chromosomes, as well as the mitochondrial genome (at bottom left). (wikipedia.org)
in this context, in order to study and verify the conservation of primate chromosomes homologous to human chromosome 13, we mapped a selected set of BAC probes in three platyrrhine species, characterised by a high level of rearrangements, using fluorescence in situ hybridisation (FISH). (nih.gov)

The history of each human chromosome can be studied through comparative cytogenetic approaches in mammals which permit the identification of human chromosomal homologies and rearrangements between species. (nih.gov)
Comparative banding, chromosome painting, Bacterial Artificial Chromosome (BAC) mapping and genome data permit researchers to formulate hypotheses about ancestral chromosome forms. (nih.gov)
Our mapping data on Saguinus oedipus, Callithrix argentata and Alouatta belzebul provide insight into synteny of human chromosome 13 evolution in a comparative perspective among primate species, showing rearrangements across taxa. (nih.gov)
These data supplemented with GTG banding comparisons allowed us to build comparative chromosome maps. (bvsalud.org)

Zoo-FISH with sorted chromosomes of the Siberian mole (Talpa altaica) on chromosome sets of the small-toothed mole (E. parvidens), the small Japanese mole (Mogera imaizumii) from the closely related genus, and the Japanese shrew mole (Urotrichus talpoides) from the tribe Urotrichini made it possible to identify syntenic regions between these species. (bvsalud.org)

Here, we used sets of chromosome-specific probes from Tamias sibiricus (Sciuridae), Castor fiber (Castoridae) and humans to study karyotypes of six ground squirrels (genera Marmota and Spermophilus) and one tree squirrel (genus Sciurus), mountain hare (genus Lepus), and rabbit (genus Oryctolagus). (bvsalud.org)

Chromosome evolution of Glires is known to have variable rates in different groups: from slowly evolving lagomorphs and squirrels to extremely rapidly evolving muroids. (bvsalud.org)

Our data allowed us to further refine the putative ancestral karyotypes of Rodentia. (bvsalud.org)