Abstract
The origin of reproductive isolating mechanisms is evidently a problem of great significance for the understanding of the process of species formation. Comparison of full-fledged species permits the study of reproductive isolation which is already established and functioning. One expects however to find within as yet undivided species the genetic materials from which the reproductive barriers between species may eventually be constructed. It is for this reason that several authors have attempted to find the possible beginnings of isolating barriers in the sexual behavior of different strains of Drosophila melanogaster (Merrell, 1949 a, b; Spieth, 1952; Knight, Robertson and Waddington, 1956; Bastock, 1956; Koref Santibanez and Waddington, 1958). It appears to us that comparisons of sexual behavior of inbred strains of the same species may be of considerable interest. Inbred strains may differ from each other, and from their outbred ancestors, in several or even in many genes. The present paper reports
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