Milosevic M, Moya A, Ayala F J
Department of Ecology and Evolutionary Biology, University of California, Irvine 92717.
Genet Res. 1991 Jun;57(3):267-72. doi: 10.1017/s0016672300029414.
Experiments were designed to test in Drosophila melanogaster the effect of mating type at the Sod locus on fertility and viability. The experiments show that fertility is neither additive (or multiplicative) nor symmetric, i.e. that the fertility of a mating type cannot be predicted from the average fertility of the two genotypes involved in the mating. There is no significant male x female interaction with respect or progeny viability; but the interaction is significant for productivity, i.e. when fertility and viability are jointly taken into account. There is overdominance with respect to female fertility, but not with respect to male fertility or to viability. There also is alloprocoptic selection with respect to fertility and with respect to productivity, i.e. mating between like homozygotes are less fertile and productive than matings between dissimilar homozygotes. Selection at the Sod locus yields stable polymorphic equilibria, with the frequency of the F allele predicted at P = 0.641 or 0.695, respectively for low and high larval density.
实验旨在测试黑腹果蝇中Sod基因座交配型对生育力和生存力的影响。实验表明，生育力既不是累加的（或相乘的）也不是对称的，也就是说，一种交配型的生育力无法根据交配中涉及的两种基因型的平均生育力来预测。在子代生存力方面，不存在显著的雄雌相互作用；但在生产力方面，即当同时考虑生育力和生存力时，这种相互作用是显著的。在雌性生育力方面存在超显性，但在雄性生育力或生存力方面不存在超显性。在生育力和生产力方面也存在异交选择，即相似纯合子之间的交配比不同纯合子之间的交配生育力和生产力更低。在Sod基因座的选择产生稳定的多态平衡，对于低幼虫密度和高幼虫密度，F等位基因的频率分别预测为P = 0.641或0.695。
