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Histograms of progeny number from vials with two females and one male for crosses within and between D. virilis and D. americana. D. virilis females produce significantly more progeny when crossed to D. virilis males than when crossed to D. americana males (Wilcoxon: Z = −7.53, P = 0.0001). Similarly, D. americana females produce significantly more progeny when crossed to D. americana males than when crossed to D. virilis males (Wilcoxon: Z = −2.34, P = 0.019).
