B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae)
Loading...
Files
External sources
External sources
Date
Advisor
Coadvisor
Graduate program
Undergraduate course
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
Type
Article
Access right
Acesso restrito
Files
External sources
External sources
Abstract
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.
Description
Keywords
Mitotic stability, Supernumerary chromosomes, Accumulation, Neutralization
Language
English
Citation
Genetica. Dordrecht: Springer, v. 138, n. 3, p. 281-284, 2010.
