Campo DC | Valor | Idioma |
dc.contributor.author | Ananias, Fernando | - |
dc.contributor.author | Modesto, Álvaro Dhimas S. | - |
dc.contributor.author | Mendes, Samantha Celi | - |
dc.contributor.author | Napoli, Marcelo Felgueiras | - |
dc.creator | Ananias, Fernando | - |
dc.creator | Modesto, Álvaro Dhimas S. | - |
dc.creator | Mendes, Samantha Celi | - |
dc.creator | Napoli, Marcelo Felgueiras | - |
dc.date.accessioned | 2012-06-21T15:21:15Z | - |
dc.date.available | 2012-06-21T15:21:15Z | - |
dc.date.issued | 2007 | - |
dc.identifier.issn | 1601-5223 | - |
dc.identifier.uri | http://www.repositorio.ufba.br/ri/handle/ri/6203 | - |
dc.description.abstract | We performed cytogenetic analyses on specimens from three population samples of Proceratophrys boiei from southeastern
and northeastern Brazil. We stained chromosomes of mitotic and meiotic cells with Giemsa, C-banding and Ag-NOR
methods. All specimens of P. boiei presented a karyotype with a full chromosome complement of 2n 22, metacentric and
submetacentric.We observed the secondary constriction within the short arm of pair 8, which was in the same position of the
nucleolus organizer region (NOR). NOR heteromorphism was observed within two specimens from the municipality of Mata
de Sa˜o Joa˜o (northeastern Bahia State). The C-banding evidenced an unusual heterochromatic pattern in the genome of P.
boiei. In the southernmost population samples (Sa˜o Paulo State), we observed large blocks of heterochromatin in the
centromeric regions of all chromosomes, whereas the northernmost samples (Bahia State) presented a small amount of
constitutive heterochromatin. We suppose that this geographic variation in heterochromatin quantities could be due to
heterochromatinization of some chromosome regions in the genome of the Sa˜o Paulo samples. Furthermore, females from
Sa˜o Paulo presented, within chromosome pair 1 from C-banded karyotypes, one homologous chromosome almost
heterochromatic, whereas males had heterochromatin restricted to the centromeric region. This unusual heterochromatic
arrangement led us to assume that P. boiei owns a ZZ/ZW type of sexual determination system. This finding is very
important, as this is the first record of ZZ/ZW sex chromosomes within Cycloramphidae. We believe that the cytogenetic
differences found between southeastern and northeastern Brazilian population samples of P. boiei strongly supports the
existence of a species complex under the name P. boiei, and the requirement of taxonomic and systematic reviews by
morphological, bioacoustical, molecular, and cytogenetic data could define this taxonomic issue in the future. | pt_BR |
dc.language.iso | en | pt_BR |
dc.publisher | Hereditas 144 | pt_BR |
dc.title | Unusual primitive heteromorphic ZZ/ZW sex chromosomes in Proceratophrys boiei (Anura, Cycloramphidae, Alsodinae), with description of C-Band interpopulational polymorphism | pt_BR |
dc.title.alternative | Hereditas 144 | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.description.localpub | Sweden | pt_BR |
Aparece nas coleções: | Artigo Publicado em Periódico (Biologia)
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