Data/hora: 09/06/2024 18:42:56

Provedor de dados: | 74
País: | Brazil
Título: | Sympatric occurrence of two cytotypes of Astyanax scabripinnis (Characiformes, Characidae)
Autores: | Maistro,Edson Luis; Oliveira,Claudio; Foresti,Fausto.
Data: | 2000-06-01
Ano: | 2000
Resumo: | Among four specimens of Astyanax scabripinnis sympatrically collected from the Tamanduá stream (State of São Paulo, Brazil), three, named cytotype I, had 2n = 50 chromosomes (6M + 26SM + 4ST + 14A) and a fundamental number (FN) of 86, and one specimen, named cytotype II, had 2n = 48 chromosomes (6M + 28SM + 4ST + 10A) and FN = 86. Besides the difference in diploid number, the cytotypes showed a clear difference in the distribution of constitutive heterochromatin. One NOR-bearing chromosome pair was detected in both cytotypes and one specimen of cytotype I had multiple NORs (tree chromosome pairs). Robertsonian translocations and an increase or loss of heterochromatin are proposed to explain the karyotypic divergence observed. Some aspects related to the chromosome evolution of Astyanax scabripinnis are discussed.
Tipo: | Info:eu-repo/semantics/other
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000200021
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572000000200021
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.23 n.2 2000
Fonte: | info:eu-repo/semantics/openAccess