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Grossen unil. Recombination arrest between X and Y chromosomes, driven by sexually antagonistic genes, is expected to induce their progressive differentiation. However, in contrast to birds and mammals which display the predicted pattern , most cold-blooded vertebrates have homomorphic sex chromosomes. Two main hypotheses have been proposed to account for this, namely high turnover rates of sex-determining systems and occasional XY recombination. Using individual-based simulations, we formalize the evolution of XY recombination here mediated by sex reversal; the "fountain-of-youth" model under the contrasting forces of sexually antagonistic selection and deleterious mutations.

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  • added: 10.08.2019
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