Abstract
IN the course of analysing the frequency of chromosomal inversions in 292 adult females of Drosophila willistoni, we have recorded for the first time evidence of crossing-over between two non-overlapping inversions in the same chromosome arm of this species. These findings are of some general interest since, as Dobzhansky and Epling1 have said: “The biological function of inversions in natural populations of Drosophila and their principal role in the evolution of these insects might be conceived to be the suppression of crossing over between gene complexes which have reached an adaptive equilibrium. Crossing over would destroy these complexes and would result in gene combinations of different adaptive values, but would be prevented by the binding effect of the inversions”.
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