title: Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae).
abstract: 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 k(B)=0.388 for the acrocentric type, a kB=0.507 for the metacentric type and a k(B)=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.
authors.affiliation: Universidade Estadual Paulista, Laboratório de Genética de Peixes, BauruSP, Brasil.
authors.forename: Manolo
authors.initials: M
authors.lastname: Penitente
authors.affiliation: Universidade Estadual Paulista, Laboratório de Genética de Peixes, BauruSP, Brasil.
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Voltolin
authors.affiliation: Centro Nacional de Pesquisa e Conservação de Peixes Continentais, nstituto Chico Mendes de Conservação da Biodiversidade, Laboratório de Genética e Reprodução de Peixes, PirassunungaSP, Brasil.
authors.forename: José A
authors.initials: JA
authors.lastname: Senhorini
authors.affiliation: Universidade Estadual Paulista, Laboratório de Genética de Peixes, BauruSP, Brasil.
authors.forename: Jehud
authors.initials: J
authors.lastname: Bortolozzi
authors.affiliation: Universidade Estadual Paulista, Laboratório de Biologia e Genética de Peixes, BotucatuSP, Brasil.
authors.forename: Fausto
authors.initials: F
authors.lastname: Foresti
authors.affiliation: Universidade Estadual Paulista, Laboratório de Genética de Peixes, BauruSP, Brasil.
authors.forename: Fábio
authors.initials: F
authors.lastname: Porto-Foresti
mesh_terms: D000818:Animals; D060125:Characiformes / Q000235:genetics*; D002875:Chromosomes / Q000235:genetics*; D020732:Cytogenetic Analysis; D005260:Female; D040582:Inheritance Patterns / Q000235:genetics*; D007621:Karyotyping; D008297:Male