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Assortative mating can impede or facilitate fixation of underdominant alleles

Author

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  • Newberry, Mitchell G.
  • McCandlish, David M.
  • Plotkin, Joshua B.

Abstract

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→∞), 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.

Suggested Citation

  • Newberry, Mitchell G. & McCandlish, David M. & Plotkin, Joshua B., 2016. "Assortative mating can impede or facilitate fixation of underdominant alleles," Theoretical Population Biology, Elsevier, vol. 112(C), pages 14-21.
    • Handle: RePEc:eee:thpobi:v:112:y:2016:i:c:p:14-21
    DOI: 10.1016/j.tpb.2016.07.003
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    References listed on IDEAS

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    1. M. Higashi & G. Takimoto & N. Yamamura, 1999. "Sympatric speciation by sexual selection," Nature, Nature, vol. 402(6761), pages 523-526, December.
    2. Durrell D. Kapan, 2001. "Three-butterfly system provides a field test of müllerian mimicry," Nature, Nature, vol. 409(6818), pages 338-340, January.
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    Cited by:

    1. Sakamoto, T. & Innan, H., 2020. "Establishment process of a magic trait allele subject to both divergent selection and assortative mating," Theoretical Population Biology, Elsevier, vol. 135(C), pages 9-18.

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