Arrest of sex-specific adaptation during the evolution of sexual dimorphism in Drosophila.

摘要: Sexually antagonistic selection arises when a trait expressed in both sexes (a shared trait) is selected towards different, sex-specific optima. Sex-discordant causes different alleles to be favoured each sex (intralocus sexual conflict). A key parameter responsible for generating this conflict the intersexual genetic correlation (rMF), which determines degree heritable variation produces similar phenotype sexes. strong, positive rMF interferes with adaptation there sex-discordant selection. In principle, can evolve response selection: faster it declines, resolution of intralocus conflict. Here, we use Drosophila melanogaster quantify time scale over impedes canonical quantitative (body size) an exceptionally long (250 generations) experiment complex multicellular organism. We found that, compared rapid and substantial evolution under sex-concordant selection, high arrested 100 generations females minimum 250 males. Our study demonstrates that lead protracted period adaptive stalemate during dimorphism.