Coyne J A
Proc Natl Acad Sci U S A. 1984 Jul;81(14):4444-7. doi: 10.1073/pnas.81.14.4444.
Drosophila simulans and Drosophila mauritiana are closely related sibling species, the former cosmopolitan and the latter restricted to the small oceanic island of Mauritius. Genetic analysis of male sterility in hybrids between these species shows that at least five loci (one on each chromosome arm) are responsible for this reproductive isolation. This is the most loci that could have been detected with the techniques used and implies that the true genetic divergence for sterility is even greater. The effects of chromosome segments on the character are roughly additive, with the X-linked segment making the largest contribution to sterility. The large effect of X chromosomes on male-limited reproductive isolation and the frequent limitation of hybrid sterility to males may be attributable to fertility interactions between X and Y chromosomes. These results parallel what has been found in other Drosophila species and relate to recent theories of how reproductive isolation evolves in small founder populations.
拟果蝇和毛里求斯果蝇是亲缘关系很近的姐妹物种,前者分布于世界各地,后者仅局限于毛里求斯的小洋岛。对这些物种之间杂交种雄性不育的遗传分析表明,至少有五个位点(每条染色体臂上一个)导致了这种生殖隔离。这是使用现有技术所能检测到的最多位点,意味着不育的真正遗传差异甚至更大。染色体片段对该性状的影响大致是累加的,其中X连锁片段对不育的贡献最大。X染色体对雄性特异性生殖隔离的巨大影响以及杂交不育通常局限于雄性,可能归因于X染色体和Y染色体之间的育性相互作用。这些结果与在其他果蝇物种中发现的情况相似,并与近期关于小种群中生殖隔离如何演化的理论相关。