Ayala F J, Mourão C A, Pérez-Salas S, Richmond R, Dobzhansky T
Proc Natl Acad Sci U S A. 1970 Sep;67(1):225-32. doi: 10.1073/pnas.67.1.225.
We have studied by gel electrophoresis the variability of 14 structural genes in four sibling species, Drosophila willistoni, D. paulistorum, D. equinoxialis, and D. tropicalis. Samples of about 30 populations from different parts of the distribution areas of each species were examined. Genetic variants are found at every locus; 67% of the loci are polymorphic, having two or more alleles, the rarer of which has a frequency of 5% or higher. The gene frequencies are fairly uniform over the distribution area of each species, but considerably different in different species. It is estimated that individuals which belong to the different species differ on the average in somewhat more than one half of their gene loci. The morphological similarity of the four sibling species contrasts with the extensive diversity in their genetic materials.
我们通过凝胶电泳研究了四种亲缘种果蝇(威氏果蝇、保罗氏果蝇、春分果蝇和热带果蝇)中14个结构基因的变异性。对来自每个物种分布区域不同部位的约30个种群的样本进行了检测。在每个基因座都发现了遗传变异;67%的基因座是多态的,有两个或更多等位基因,其中较罕见的等位基因频率为5%或更高。基因频率在每个物种的分布区域内相当均匀,但在不同物种之间有很大差异。据估计,属于不同物种的个体平均在一半以上的基因座上存在差异。这四种亲缘种的形态相似性与其遗传物质的广泛多样性形成了对比。