D.True. Positive frequency dependen

D.True. Positive frequency dependent selection gives an advantage to commonphenotypes. This means that new alleles can have a difficult time invading apopulation, since they don't experience significant benefit until they becomecommon. This has been proposed as a difficulty in the evolution of aposematic (orwarning) coloration in toxic or distasteful organisms. The presumed advantage ofthe aposematic coloration is that predators have learned to avoid potential preywith that color pattern. But when the pattern is rare, the predator population doesnot become 'educated' and the pattern has no benefit. Therefore the warning coloris only advantageous once it has become common.