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

ABSTRACT: 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 frequency-dependent selection should also be more likely to re-invade populations than recessive alleles, due to Haldane's Sieve, because recessive alleles not expressed in a heterozygote state cannot benefit from positive selection when rare. We used computer simulations of tristylous metapopulations to verify that Haldane's Sieve acting on migrants into occupied d

SUBMITTER: Roux C 

PROVIDER: S-EPMC6856859 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature