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- B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae)
- Universidade Estadual Paulista (UNESP)
- Ctr Nacl Pesquisa & Conservacao Peixes Continenta
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- 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.
- Genetica. Dordrecht: Springer, v. 138, n. 3, p. 281-284, 2010.
- Mitotic stability
- Supernumerary chromosomes
- Acesso restrito
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