Selection for sex in finite populations.

摘要: Finite population size generates interference between selected loci, which has been shown to favour increased rates of recombination. In this article, I present different analytical models exploring selection acting on a ‘sex modifier locus’ (that affects the relative investment into asexual and sexual reproduction) in finite population. Two forms selective forces act modifier: direct due intrinsic costs associated with reproduction indirect generated by one or two other loci affecting fitness. The results show that differ from those recombination even case haploid population: particular, single locus for sex, while are required modifier. This effect stems fact alleles increasing sex escape more easily low-fitness genetic backgrounds than coding lower sex. Extrapolating three-locus large number at mutation–selection balance indicates parameter range where is strong enough outweigh substantial cost interactions have stronger sum individual effects each locus. Comparisons multilocus simulation such extrapolations may provide correct predictions evolutionarily stable rate unless high.