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1 November 2009 Maintenance or Loss of Genetic Variation Under Sexual and Parental Antagonism at a Sex-Linked Locus
Manus M. Patten, David Haig
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Abstract

An intralocus genetic conflict occurs when a locus is selected in opposing directions in different subsets of a population. Populations with two sexes have the potential to host a pair of distinct intralocus conflicts: sexual antagonism and parental antagonism. In this article, we examine the population genetic consequences of these conflicts for X-linked genes. Both conflicts are capable of maintaining genetic variation in a population, but to different degrees. For weak sexual antagonism, the X chromosome has a higher opportunity for polymorphism than the autosomes. For parental antagonism, there is a very limited opportunity for polymorphism on the X chromosome relative to autosomes or to sexual antagonism. X-linkage introduces an asymmetry in the inheritance and expression of sexually and parentally antagonistic genes that leads to a biased fixation of alleles with certain effects. We find little support for the commonly held intuition that the X chromosome should be biased toward fixing female-beneficial alleles. Contrary to this intuition, we find that the X chromosome is biased toward fixation of male-beneficial alleles for much of the range of dominance. Additionally, we find that the X chromosome is more favorable to the fixation of alleles that are beneficial when maternally derived.

© 2009 The Society for the Study of Evolution.
Manus M. Patten and David Haig "Maintenance or Loss of Genetic Variation Under Sexual and Parental Antagonism at a Sex-Linked Locus," Evolution 63(11), 2888-2895, (1 November 2009). https://doi.org/10.1111/j.1558-5646.2009.00764.x
Received: 21 February 2009; Accepted: 1 May 2009; Published: 1 November 2009
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KEYWORDS
chromosomal evolution
genetic variation
selection—sexual
sexual conflict
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