Johnson N A, Wu C I
Department of Biology, University of Rochester, New York 14627.
Genetics. 1992 Mar;130(3):507-11. doi: 10.1093/genetics/130.3.507.
Recently, there has been much discussion regarding the hypothesis that divergence of meiotic drive systems in isolated populations can generate the patterns of reproductive isolation observed in animal hybridizations. One prediction from this hypothesis is that the sex ratio of hybrids with heterospecific sex chromosomes should greatly deviate from the Mendelian expectation of 50% female. From sex-ratio data in our Drosophila hybridization studies, we find no such deviation: the sex ratio of offspring of males with introgressed heterospecific Y chromosomes with various autosomal backgrounds does not differ from that of the pure species. We also discuss other aspects of the current meiotic drive models.
最近,关于减数分裂驱动系统在隔离种群中的分化会产生动物杂交中所观察到的生殖隔离模式这一假说,已有诸多讨论。该假说的一个预测是,具有异源特异性性染色体的杂种的性别比例应大大偏离孟德尔预期的50%雌性。从我们对果蝇杂交研究中的性别比例数据来看,我们并未发现这种偏差:具有渗入异源特异性Y染色体且有各种常染色体背景的雄性后代的性别比例与纯物种的性别比例并无差异。我们还讨论了当前减数分裂驱动模型的其他方面。