Data/hora: 02/06/2024 00:41:26

Provedor de dados: | Neotropical Ichthyology
País: | Brazil
Título: | Chromosome polymorphism of heterochromatin and nucleolar regions in two populations of the fish Astyanax bockmanni (Teleostei: Characiformes)
Autores: | Hashimoto,Diogo Teruo; Porto-Foresti,Fábio.
Data: | 2010-01-01
Ano: | 2010
Palavras-chave: | Fish cytogenetics; Chromosomal rearrangements; Karyotype differentiation.
Resumo: | Karyotype and other chromosomal markers as revealed by C-banding and silver (Ag) impregnation in two Astyanax bockmanni populations (Barra Seca Stream and Campo Novo River) were examined. The diploid chromosome number 2n = 50 and nearly identical karyotypes were documented. C-banding revealed heterochromatic blocks on the terminal regions of some chromosomes, with high frequencies of polymorphisms. The Ag-impregnation showed that the nucleolus organizer regions (NORs) varied in number, location and organization. Astyanax bockmanni revealed chromosome characteristics similar those of the species complex "A. scabripinnis". Mechanisms that may be responsible for the high degree of polymorphism are discussed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400016
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252010000400016
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.8 n.4 2010
Fonte: | info:eu-repo/semantics/openAccess