Evolution of sexual isolation in laboratory populations: fitness differences between mating types and the associated hybrid incompatibilities.

Abstract excerpt

Drosophila melanogaster is known to have two races in the incipient stages of speciation that exhibit strong asymmetric premating isolation: Zimbabwe (Z) and cosmopolitan (M). In a study examining the phenotypic and genotypic evolution after secondary contact, we found that despite strong sexual selection favoring the Z-type behavior, it is the M-type behavior that comes to dominate hybrid populations. This...

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