ZOO-FISH and R-banding reveal extensive conservation of human chromosome regions in euchromatic regions of river buffalo chromosomes. (cnr.it)
Cytogenetically, the species of the genus Melipona show variation in the amount and distribution of heterochromatin along their chromosomes and can be separated into 2 groups: the first with low content of heterochromatin and the second with high content of heterochromatin. (karger.com)
These heterochromatin patterns and the number of chromosomes are characteristics exclusive to Melipona karyotypes that distinguish them from the other genera of the Meliponini. (karger.com)
In general, Melipona species have 2n = 18 chromosomes, and the species of each subgenus share the same characteristics in relation to heterochromatin regions, DAPI/CMA 3 fluorophores, and the number and distribution of 18S rDNA sites. (karger.com)
Astyanax sp (2n = 52), in addition to variations due to heterochromatic blocks, has its origin possibly by events of centric fission in a pair of chromosomes followed by minor rearrangements.These results show an interesting karyotypic diversity in Astyanax and indicate the need of a review of the group referred as A. aff. (scielo.org)
Ribosomal2
The heterochromatin consists mainly of short, simple sequence elements repeated for many megabases, occasionally interrupted by inserted transposable elements, and tandem arrays of ribosomal RNA genes. (harvard.edu)
A detailed cytogenetic study based on conventional staining with Giemsa, AgNORs, C-banding, base-specific fluorochromes, and FISH using ribosomal genes 18S and 5S was conducted, aiming to understand some of the chromosomal mechanisms associated with the high diversification that characterizes this group and culminated with the establishment of these species. (scielo.org)
Heterochromatic1
Differential staining divides chro-mosome into heterochromatic and euchromatic regions. (preservearticles.com)
Chromosome4
Abstract: '[Researchers] have determined the nucleotide sequence of nearly all of the approximately 120-megabase euchromatic portion of the Drosophila genome using a whole-genome shotgun sequencing strategy supported by extensive clone-based sequence and a high-quality bacterial artificial chromosome physical map. (harvard.edu)
The combination of these resources resulted in a set of ordered contigs spanning nearly all of the euchromatic region on each chromosome arm. (harvard.edu)
acro-centric , when the centromere is close to one end of the chromosome and te-locentric , when one arm of the chro-mosome is completely absent and the centromere is terminal. (preservearticles.com)
It is generally the most active region of chromosome, as it harbours the functional genes. (preservearticles.com)
Regions2
These are called the chromomeres and are believed to be the regions representing genes. (preservearticles.com)
Retrotransposons, a class of TEs, are often located in repressed regions and are thought to induce heterochromatin formation and spreading. (prolekarniky.cz)
FISH2
Chromosomal characterization of three centric fusion translocations in cattle using G-, R- and C-banding and FISH technique. (cnr.it)
Um estudo citogenético detalhado com base na coloração convencional com Giemsa, AgNORs, banda C, fluorocromos base-específicos, e FISH com sondas para genes ribossomais 18S e 5S foi realizado com o objetivo de compreender alguns dos mecanismos cromossômicos associados com a alta diversificação que caracteriza este grupo de peixes e que culminou com o estabelecimento dessas espécies. (scielo.org)