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Sex Chromosomes and the Evolution of Sexual Dimorphism

William R. Rice
Evolution
Vol. 38, No. 4 (Jul., 1984), pp. 735-742
DOI: 10.2307/2408385
Stable URL: http://www.jstor.org/stable/2408385
Page Count: 8
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Sex Chromosomes and the Evolution of Sexual Dimorphism
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Abstract

An analytical model was used to explore the effect of X-linkage on the evolution of sexual dimorphism. The model examined the requisite conditions for increase when rare, and the equilibrium frequency of genes that produce a "sexually-antagonistic" phenotype, i.e., a phenotype that is selectively favored in one sex but disfavored in the other sex. A simulation model was used to examine the evolution of sex-limited modifier genes that restrict the expression of sexually-antagonistic genes in the sex where they are selected against. The conclusion from this analysis is that sex chromosomes facilitate the evolution of sexual dimorphism and that X-linked genes have a predominant role in coding for sexually dimorphic traits.

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