Assortative mating can impede or facilitate fixation of underdominant alleles. (English) Zbl 1367.92077
Summary: Underdominant mutations have fixed between divergent species, yet classical models suggest that rare underdominant alleles are purged quickly except in small or subdivided populations. We predict that underdominant alleles that also influence mate choice, such as those affecting coloration patterns visible to mates and predators alike, can fix more readily. We analyze a mechanistic model of positive assortative mating in which individuals have \(n\) chances to sample compatible mates. This one-parameter model naturally spans random mating (\(n = 1\)) and complete assortment (\(n \rightarrow \infty\)), yet it produces sexual selection whose strength depends non-monotonically on \(n\). This sexual selection interacts with viability selection to either inhibit or facilitate fixation. As mating opportunities increase, underdominant alleles fix as frequently as neutral mutations, even though sexual selection and underdominance independently each suppress rare alleles. This mechanism allows underdominant alleles to fix in large populations and illustrates how life history can affect evolutionary change.
Keywords:
mate choice; diffusion; heterosis; slow manifold; best-of-\(n\); Hardy-Weinberg equilibriumReferences:
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