Genetic divergence in M. Vetukhiv's experimental populations ofDrosophila pseudoobscura1. Rudiments of sexual isolation

Abstract

Weak but statistically significant sexual isolation has been demonstrated among Vetukhiv's six experimental populations ofDrosophila pseudoobscura, all originally descended from founders taken from cultures of the same hybrids from four geographic localities. These six populations were maintained separately for almost 4½ years and then tested for the existence of sexual isolation. The sexual isolation has arisen in the absence of any selection for isolation, evidently as a by-product of genetic divergence.