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MOLINA, WAGNER F.; MARTINEZ, PABLO A.; BERTOLLO, LUIZ A.C.  and  BIDAU, CLAUDIO J.. Preferential accumulation of sex and Bs chromosomes in biarmed karyotypes by meiotic drive and rates of chromosomal changes in fishes. An. Acad. Bras. Ciênc. [online]. 2014, vol.86, n.4, pp.1801-1812. ISSN 0001-3765.

Mechanisms of accumulation based on typical centromeric drive or of chromosomes carrying pericentric inversions are adjusted to the general karyotype differentiation in the principal Actinopterygii orders. Here, we show that meiotic drive in fish is also supported by preferential establishment of sex chromosome systems and B chromosomes in orders with predominantly bi-brachial chromosomes. The mosaic of trends acting at an infra-familiar level in fish could be explained as the interaction of the directional process of meiotic drive as background, modulated on a smaller scale by adaptive factors or specific karyotypic properties of each group, as proposed for the orthoselection model.

Keywords : Actinopterygii; B chromosomes; centromeric drive; chromosome evolution; sex chromosomes.

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