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Random Mating in Two Species of Drosophila

Data are presented which show a very high frequency (between 40% and 100%) of repeated mating by female Drosophila athabasca, Eastern A. No deviations from random mating, either as disproportionate representation of male genotypes in the mating population or as deviations from random choice of mates by members of the mating population, were evident in any of the D. athabasca or D. melanogaster populations sampled. The data do not rule out the possibility of frequency-dependent mate selection in a nonequilibrium population. We have compared the magnitudes of the deviations from random mating reported in the literature to the magnitude of the deviations we could have detected with our genetic system and sample sizes. Deviations from random mating might well have been found had they occurred to the same degree as previously detected.