Abstract
The cosmopolitan sibling speciesDrosophila simulans andD. melanogaster are sympatric over most of their range but both are allopatric toD. mauritiana. D. melanogaster is sexually isolated from both of the other species, whereas betweensimulans andmauritiana isolation is asymmetric. The interspecific hybrid females derived from these two species copulate readily with hybrid males and with males of both parental species. Differences in the expression of the components of male courtship behavior betweensimulans andmauritiana are quantitative rather than qualitative in nature, and the differences in the duration of courtship to copulation and the amount of scissoring in the male wing display are influenced by both autosomal and sex-linked genes. The asymmetric isolation appears to involve both the conspecific recognition mechanism and the effects of sexual selection.
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