| Full text | |
| Author(s): |
Silva, M. J. J.
;
Yonenaga-Yassuda, Y.
[2]
Total Authors: 2
|
| Document type: | Journal article |
| Source: | Cytogenetic and Genome Research; v. 106, n. 2/4, p. 257-263, 2004. |
| Field of knowledge: | Biological Sciences - Genetics |
| Abstract | |
B chromosomes are now known in eight Brazilian rodent species: Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys sp. 2 and Trinomys iheringi. Typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of NORs, and presence/absence of interstitial telomeric signals after FISH. In most cases, Bs are heterochromatic and late replicating. Active NORs were detected in two species: Akodon montensis and Oryzomys angouya. As a rule, Bs behave as uni or bivalents in meiosis, there is no pairing between Bs and autosomes or sex chromosomes and also their synaptonemal complexes are isopycnotic with those in A chromosomes. (AU) | |
| FAPESP's process: | 99/11653-6 - Evolutionary studies in vertebrates: I. Cytogenetic, molecular and morphological analyses. II. Karyotypical survey of Brazilian fauna. III. Cell and tissue collection of mammals, lizards and amphibians |
| Grantee: | Yatiyo Yonenaga-Yassuda |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 98/05075-7 - Systematics, Evolution and Conservation of Eastern Brazilian Mammals |
| Grantee: | Mario de Vivo |
| Support Opportunities: | BIOTA-FAPESP Program - Thematic Grants |