Why does the fitness of a phenotype depend on frequency-dependent selection?
A) Because selection favours the least common phenotype.
B) Because the least number of alleles are at that locus.
C) Because sexual selection produces dimorphism.
D) Because frequency-dependent selection acts against extreme phenotypes.

Question

Quizplus · Accepted Answer

Frequency-dependent selection tends to favour intermediate phenotypes by acting against the most common phenotype, thus reducing its advantage. This means that extreme phenotypes towards either end of the distribution are selected against, and the fitness of the phenotype depends on its frequency in the population. Therefore, D is the best answer as it accurately describes the effect of frequency-dependent selection on phenotype fitness.

Why Does the Fitness of a Phenotype Depend on Frequency-Dependent