Department of Biophysics and Theoretical Biology, University of Chicago, Chicago, Illinois 60637.
Proc Natl Acad Sci U S A. 1981 Jun;78(6):3721-5. doi: 10.1073/pnas.78.6.3721.
The joint evolution of female mating preferences and secondary sexual characters of males is modeled for polygamous species in which males provide only genetic material to the next generation and females have many potential mates to choose among. Despite stabilizing natural selection on males, various types of mating preferences may create a runaway process in which the outcome of phenotypic evolution depends critically on the genetic variation parameters and initial conditions of a population. Even in the absence of genetic instability, rapid evolution can result from an interaction of natural and sexual selection with random genetic drift along lines of equilibria. The models elucidate genetic mechanisms that can initiate or contribute to rapid speciation by sexual isolation and divergence of secondary sexual characters.
多配偶制物种中，雄性只为下一代提供遗传物质，而雌性则有许多潜在的配偶可供选择，对雌性的交配偏好和雄性的第二性征的共同进化进行建模。尽管对雄性有稳定的自然选择，但各种类型的交配偏好可能会导致一种失控的过程，其中表型进化的结果严重依赖于种群的遗传变异参数和初始条件。即使没有遗传不稳定性，自然选择和性选择与沿着平衡线的随机遗传漂变的相互作用也会导致快速进化。这些模型阐明了可以通过性隔离和第二性征的分歧来启动或促进快速物种形成的遗传机制。
