Many Drosophila species exhibit genetic variation in traits affecting mate choice (Scott & Richmond, 1988; MarõÂn, 1994; Aspi & Hoikkala, 1995). This variation forms the basis for sexual selection (exercised) by the females within a species and may also give rise to isolation between geographically separated populations (Markow, 1991). Studies on genetic variation in traits affecting mate choic...
