Abstract
Inbreeding effects on egg hatchability and viability of Drosophila melanogaster are analysed in relation with a single genetic system, with alleles Is- and Is+, which is postulated to control inbreeding sensitivity of natural populations. The frequency of the Is allelic constitution has been estimated by two different ways in eleven natural populations. This provides the basis for a straightforward test of the single-locus hypothesis of inbreeding sensitivity. A positive, though slight correlation between the two estimates (r=0.39) adds to the evidence in support of the hypothesis. Furthermore, the frequency of the Is allelic constitution ranges from 0.23 to 0.61 in the populations. These high frequency values suggest that the Is system may have a great impact in determining the response of a population to inbreeding and thus the valuc of genetic load. We relate this single-gene phenomenon to mutator effects and the single-gene determinism of self-incompatibility in plants and fungi.
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