The opposing effects of genetic drift and Haldane's sieve on floral‐morph frequencies in tristylous metapopulations

Summary Tristyly is a genetic floral polymorphism in which three floral morphs are maintained at equal frequencies by negative frequency‐dependent selection on alleles at two interacting loci. Because dominant alleles at these loci are maintained at a lower frequency than their recessive counterparts, they are more likely to be lost by founder events and genetic drift. Here we examine the hypothesis that dominant alleles under negative...