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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765

Abstract

PENITENTE, MANOLO et al. Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae). An. Acad. Bras. Ciênc. [online]. 2013, vol.85, n.4, pp.1371-1377.  Epub Sep 27, 2013. ISSN 0001-3765.  http://dx.doi.org/10.1590/0001-3765201387611.

Cytogenetic studies were developed in Prochilodus lineatus (Valenciennes 1836), describing an interesting system of small supernumerary chromosomes. The purpose of this work is to study the frequency and morphology of B chromosomes in individuals from the parental line and the inheritance patterns of these elements in individuals obtained from controlled crosses in the species P. lineatus. The transmission rate of B chromosomes revealed a kB=0.388 for the acrocentric type, a kB=0.507 for the metacentric type and a kB=0.526 for the submetacentric type. The obtained results raise hypothesis that B-acrocentric chromosomes are involved in an extinction process in this species, while the metacentric and submetacentric supernumerary elements comprises a neutral mechanism and follows a Mendelian transmission rate.

Keywords : supernumerary chromosomes; controlled crosses; curimbatá; cytogenetic; inheritance.

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