Abstract
The genetic factors involved in the sexual isolation between Drosophila simulans females and D. melanogaster males are hardly known. We present a study of female mating propensity of D. simulans from different geographic origins with D. melanogaster males. Our results reveal the existence of genetic variability in D. simulans for this trait. Female discrimination is dominant against high female interspecific mating, which differs from that detected in other Drosophila species crosses.
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