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The Evolution of Costly Mate Preferences I. Fisher and Biased Mutation
Andrew Pomiankowski, Yoh Iwasa and Sean Nee
Vol. 45, No. 6 (Sep., 1991), pp. 1422-1430
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2409889
Page Count: 9
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Fisher's runaway process is the standard explanation of the evolution of exaggerated female preferences. But mathematical formulations of Fisher's process (haploid and additive diploid) show it cannot cause stable exaggeration if female preference carries a cost. At equilibrium female fitness must be maximized. Our analysis shows that evolutionary stable exaggeration of female preference can be achieved if mutation pressure on the male character is biased, that is, mutation has a directional effect. At this equilibrium female fitness is not maximized. We discuss the reasons and evidence for believing that mutation pressure is typically biased. Our analysis highlights the previously unacknowledged importance of biased mutation for sexual selection.
Evolution © 1991 Society for the Study of Evolution