Indirect negative evidence for frequency-dependent selection with respect to viability in Drosophila melanogaster.

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Abstract
Using the estimates of additive genetic variance and dominance variance as well as the regression coefficient to hetreozygotes on the sums of the component homozygotes .**GRAPHIC**. and the inverse of the regression coefficient of the sum of the 2 homozygotes on their heterozygotes .**GRAPHIC**. with respect to viability estimated by the Cy method, it was tested whether or not frequency-dependent selection is a general rule with respect to viability polygenes. Two types of frequency-dependent selection models were considered: gene frequency-dependent model and zygotic frequency-dependent model. The .**GRAPHIC**. and .**GRAPHIC**. values predicted on the basis of the frequency-dependent selection models and the ratio of the dominance variance to the additive variance are inconsistent with the actual estimates of these parameters for the Florida [USA], Ishigaki-jima (Japan), Raleigh [North Carolina, USA] and Aomori (Japan) populations. The same conclusion was obtained for newly arisen polygenic viability mutations. Frequency-dependent selection is not a general rule for viability polygenes as well as polymorphic isozyme genes.

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