DNA sequence variation at the period locus reveals the history of species and speciation events in the Drosophila virilis group.
DNA sequence variation at the period locus reveals the history of species and speciation events in the Drosophila virilis group.
复制标题
周期基因座的 DNA 序列变异揭示了果蝇 virilis 群体的物种历史和物种形成事件。
作者：
H. Hilton;Jody Hey
果蝇群的阳春门由5个亲缘关系密切的类群组成：D.virilis、D lummei、D novamiciana、D americana和D americana Texas ana。来自周期基因的一对2.1kb部分的DNA序列是在来自五个分类群的每个分类群的四到八个个体中产生的。我们发现了物种内重组和高水平变异的证据。我们没有发现最近自然选择的证据。令人惊讶的是，没有证据表明D.A.americana和D.A.Texas ana之间存在差异，它们总体上似乎具有较大的历史有效种群规模。这两个分类群的范围在一个大的杂交区重叠，这个杂交区是根据染色体融合的地理模式在美国东部划定的。同样令人惊讶的是，诺氏沼虾似乎由两个不同的种群组成，每个种群的种群规模都很小，而且它们之间没有基因流动。
The virilis phylad of the Drosophila virilis group consists of five closely related taxa: D. virilis, D. lummei, D. novamexicana, D. americana americana and D. americana texana. DNA sequences from a 2.1-kb pair portion of the period locus were generated in four to eight individuals from each of the five taxa. We found evidence of recombination and high levels of variation within species. We found no evidence of recent natural selection. Surprisingly there was no evidence of divergence between D. a. americana and D. a. texana, and they collectively appear to have had a large historical effective population size. The ranges of these two taxa overlap in a large hybrid zone that has been delineated in the eastern U.S. on the basis of the geographic pattern of a chromosomal fusion. Also surprisingly, D. novamexicana appears to consist of two distinct groups each with low population size and no gene flow between them.
影响因子：
3.3
作者：
R. Hudson;M. Slatkint;W. Maddison
通讯作者：
R. Hudson;M. Slatkint;W. Maddison