B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae)
Nenhuma Miniatura disponível
Data
2010-03-01
Autores
Voltolin, Tatiana Aparecida [UNESP]
Senhorini, Jose Augusto [UNESP]
Oliveira, Claudio [UNESP]
Foresti, Fausto [UNESP]
Bortolozzi, Jehud
Porto-Foresti, Fábio [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
Resumo
The genus Prochilodus includes individuals ranging in size from medium to large, being highly relevant for commercial and subsistence fishing. Prochilodus species have a diploid number of 2n = 54 chromosomes and up to seven supernumerary (B) microchromosomes. Previous research has shown that B frequency increased drastically in the Mogi-Gua double dagger u river population of Prochilodus lineatus in the early 1980s, whereas it remained about constant in the 1990s. Here we analyses B frequency in this population during the 2003-2007 period and have found that frequency has not changed significantly since 1987, and that these B chromosomes do not show the intra-individual variation in number that characterized them in the 1980s. This indicates that these B chromosomes have been neutralized, after their invasion, through their mitotic stabilization.
Descrição
Palavras-chave
Mitotic stability, Supernumerary chromosomes, Accumulation, Neutralization
Como citar
Genetica. Dordrecht: Springer, v. 138, n. 3, p. 281-284, 2010.