Ehrman L
Proc Natl Acad Sci U S A. 1970 Feb;65(2):345-8. doi: 10.1073/pnas.65.2.345.
The mating advantage of rare Drosophila males in tested using two eye color mutants. In one experiment, the flies remained for three hours in observation chambers containing 25 pairs; in another experiment they stayed for 24 hours in mass cultures of 200 individuals. The outcome of this latter experiment was followed for ten generations, with all competition other than that for mates eliminated. For initial frequencies of 80 per cent for the common and 20 per cent for the rare type, the frequencies converged to approximate equality because the rare males were favored as mates. When the formerly rare type increases in frequency, it loses its mating advantage, and a balanced equilibrium is eventually attained.
利用两种眼色突变体测试稀有果蝇雄性的交配优势。在一项实验中，果蝇在含有25对果蝇的观察室中停留3小时；在另一项实验中，它们在200只个体的大规模培养物中停留24小时。对后一项实验的结果跟踪了十代，消除了除配偶竞争之外的所有竞争。对于常见类型初始频率为80%、稀有类型初始频率为20%的情况，频率趋于近似相等，因为稀有雄性作为配偶更受青睐。当以前稀有的类型频率增加时，它就会失去交配优势，最终达到平衡。
