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vol. 174, supplement the american naturalist july 2009 Spatial Heterogeneity and the Evolution of Sex in Diploids
 

Summary: vol. 174, supplement the american naturalist july 2009
Spatial Heterogeneity and the Evolution of Sex in Diploids
Aneil F. Agrawal*
Department of Ecology and Evolutionary Biology, University of Toronto, 25 Wilcocks Street, Toronto, Ontario M5S 3B2, Canada
abstract: Much of the theoretical work on the evolution of sex
has focused on the effects of recombination. In diploids, segregation
also occurs during sexual reproduction. Segregation breaks down
some types of genetic associations that are not affected by recom-
bination and thus influences the evolution of sex in ways that are
not apparent from studying the evolution of recombination as a
surrogate for sex. Here I examine the evolution of sex in diploids
experiencing spatially heterogeneous selection. If divergent selection
causes genetic differentiation, then migration can be a powerful force
generating genetic associations that may not be favored by selection.
An advantage to sex can arise from breaking down these associations.
By examining modifiers of both sex and recombination, the model
allows for a direct comparison of the forces acting on these related
but different processes, illuminating the role of segregation. The
model also includes inbreeding, which has been shown to be im-
portant for both segregation and recombination. I find that inbreed-

  

Source: Agrawal, Aneil F. - Department of Ecology and Evolutionary Biology, University of Toronto

 

Collections: Environmental Sciences and Ecology