Mar 3, 2015

Self-fertilization and inbreeding limit the scope for sexually antagonistic polymorphism

Journal of Evolutionary Biology
S J Tazzyman, Jessica K Abbott

Abstract

Sexual antagonism occurs when there is a positive intersexual genetic correlation in trait expression but opposite fitness effects of the trait(s) in males and females. As such, it constrains the evolution of sexual dimorphism and may therefore have implications for adaptive evolution. There is currently considerable evidence for the existence of sexually antagonistic genetic variation in laboratory and natural populations, but how sexual antagonism interacts with other evolutionary phenomena is still poorly understood in many cases. Here, we explore how self-fertilization and inbreeding affect the maintenance of polymorphism for sexually antagonistic loci. We expected a priori that selfing should reduce the region of polymorphism, as inbreeding reduces the frequency of heterozygotes and speeds fixation. This expectation was supported, but although previous results suggest that the more an allele that is deleterious to one sex is dominant in that sex, the smaller the region of parameter space that will admit polymorphism, we found that this effect is weakened by self-fertilization. However, the effect of inbreeding is not strong enough to completely cancel out the effect of dominance: For a given frequency of inbreeding, it wil...Continue Reading

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References

Mentioned in this Paper

Gene Polymorphism
Sample Fixation
Laboratory
Sexual Dimorphism
Anatomical Space Structure
Alleles
Antagonists
Genetic Polymorphism
Inbreeding
Metabolic Phenomena

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