SEXUAL ISOLATION IN DROSOPHILA-MELANOGASTER - A POSSIBLE CASE OF INCIPIENT SPECIATION
SEXUAL ISOLATION IN DROSOPHILA-MELANOGASTER - A POSSIBLE CASE OF INCIPIENT SPECIATION
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DOI：
10.1073/pnas.92.7.2519
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发表时间：
1995-03-28
影响因子：
11.1
通讯作者：
WU, ML
中科院分区：
文献类型：
--
作者：
WU, CI;HOLLOCHER, H;WU, ML
一般认为，黑腹果蝇没有密切相关的物种，它可以产生可行的和可育的杂种，这是必要的物种形成的遗传分析。继最近报道的分子分化之间的津巴布韦，非洲，人口和两个美国人口，我们提供的证据表明，强烈的性隔离之间存在的D。在津巴布韦的黑腹果蝇种群和其他大陆的种群中，在它们自己种类的雄性存在的情况下，来自津巴布韦的大多数同雌系的雌性不会与来自其他地方的雄性交配;相互交配也显着减少，但程度较轻。性行为的基因在津巴布韦显然是多态性的，交配后生殖隔离这与其他人群之间还没有发展。全染色体置换表明两个主要常染色体对雄性交配成功有显著的遗传贡献，而X染色体效应太弱而无法测量。此外，杂交和纯系雄性之间的相对交配成功率支持了强雌性选择的解释，这些观察结果表明，我们正在看到这个群体的早期物种形成，它是由性选择驱动的。对D. melanogaster为详细分析这种早期物种形成的明显案例提供了很大的希望。
It is generally believed that Drosophila melanogaster has no closely related species with which it can produce the viable and fertile hybrids that are essential for the genetic analysis of speciation. Following the recent report of molecular differentiation between a Zimbabwe, Africa, population and two United States populations, we provide evidence that strong sexual isolation exists between the D. melanogaster population in Zimbabwe and populations of other continents, In the presence of males of their own kind, females from most isofemale lines of Zimbabwe would not mate with males from elsewhere; the reciprocal mating is also significantly reduced, but to a lesser degree. The genes for sexual behaviors are apparently polymorphic in Zimbabwe and postmating reproductive isolation between this and other populations has not yet evolved. Whole chromosome substitutions indicate significant genetic contributions to male mating success by both major autosomes, whereas the X chromosome effect is too weak to measure. In addition, the relative mating success between hybrid and pure line males supports the interpretation of strong female choice, These observations suggest that we are seeing the early stages of speciation in this group and that it is driven by sexual selection. The genetic and molecular tractability of D. melanogaster offers great promise for the detailed analysis of this apparent case of incipient speciation.