Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae)

Anais da Academia Brasileira de Ciências

Manolo Penitente¹  Tatiana A. Voltolin¹  José A. Senhorini¹  Jehud Bortolozzi¹  Fausto Foresti¹  Fábio Porto-foresti¹ 

关键词: supernumerary chromosomes;    controlled crosses;    curimbatá;    cytogenetic;    inheritance;    cromossomos supranumerários;    cruzamentos controlados;    curimbatá;    citogenética;    herança;   

DOI  :  10.1590/0001-3765201387611

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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