Sex-Dependent Inheritance of B Chromosomes in Psalidodon paranae (Teleostei, Characiformes) Revealed by Directed Crossings

Made available in DSpace on 2022-04-29T08:38:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-12-01 B chromosomes are additional dispensable elements to the standard chromosomal set of an organism. In most cases, their transmission differs from Mendelian patterns, leading to their accumulation or extinction. The present study aimed to describe, for the first time, the transmission pattern of B chromosome in a population of Psalidodon paranae through directed crosses, as well as to analyze the populational dynamics of B chromosome. Our results revealed the possible elimination of B chromosome in crossings where only females were B-carriers, with a mean transmission rate (kB) of 0.149; however, kB was significantly higher in crossings involving male B-carriers (kB = 0.328-0.450). Moreover, we observed an increase in the frequency of B chromosomes in the natural population of P. paranae in the last two decades. These apparently contradictory results can make sense if the B chromosome provides adaptive advantages to their carriers. Here, we observed a differential transmission of B chromosomes in each sex of parental individuals, with higher transmission rates in crossing involving males B-carriers, in addition to describe the temporal changes of B chromosome frequency in P. paranae. Departamento de Ciências Biológicas Faculdade de Ciências Universidade Estadual Paulista (UNESP) júlio de Mesquita Filho Departamento de Biologia Estrutural e Funcional Instituto de Biociências Universidade Estadual Paulista júlio de Mesquita Filho (UNESP) Departamento de Genética Instituto de Ciências Biológicas e da Saúde Icbs Universidade Federal Rural Do Rio de Janeiro Centro Nacional de Pesquisa e Conservacao da Biota Aquatica Continental (CEPTA-ICMBIO) Centro de Aquicultura da Unesp Universidade Estadual Paulista júlio de Mesquita Filho (UNESP) Departamento de Biologia Estrutural Molecular e Genética Setor de Ciências Biológicas e da Saúde Universidade Estadual de Ponta Grossa Departamento de Ciências Biológicas Faculdade de Ciências Universidade Estadual Paulista (UNESP) júlio de Mesquita Filho Departamento de Biologia Estrutural e Funcional Instituto de Biociências Universidade Estadual Paulista júlio de Mesquita Filho (UNESP) Centro de Aquicultura da Unesp Universidade Estadual Paulista júlio de Mesquita Filho (UNESP)