Mating success was examined in groups of Drosophila melanogaster carrying mutation flam~MS (SS, MSn1-2, and MSn1-3) and in wild-type flies. The proportion of normally populating males was significantly lower in the mutant strains. The reduction in mating efficiency was caused by changes in male behavior rather than in female attractiveness. Individual analyses showed that male mating behavior in strains carrying flam~MS was qualitatively and quantitatively different form that in the wild-type strain Canton S. The proportion of males that performerd consecutive courtship stages was significantly lower in the mutant strains. The sequence and duration of some courtship stages (in particular, orientation and wing vibration) in mutant flies was shown to be altered. The significance of the flamenco locus in regulation of processed occurring at the organismal level are discussed.
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