Selection in a polymorphism with a rare allele


Two densities, two temperatures and three genotypic compositions were used to study selection in cultures of Drosophila polymorphic for Est-6. The alleles used were the common Est6 s and Est6 VF which has a frequency of about 0.03 in Italian natural populations. Significant effects of all variables on viability were seen and interaction of both the environmental variables with genotypic composition occurs. While frequency-dependent selection is demonstrated in many combinations it is least evident at the genotypic composition (pVF = 0.2) closest to that found in nature where heterotic selection appears to be important. The significance of these findings for the maintenance of the polymorphism in nature is briefly discussed.

DOI: 10.1007/BF00055987

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@article{Costa2004SelectionIA, title={Selection in a polymorphism with a rare allele}, author={Rodrigo Costa and John A. Beardmore}, journal={Genetica}, year={2004}, volume={54}, pages={167-172} }