When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the majority sex. This is most clearly an example of ________.

Question

Quizplus · Accepted Answer

This phenomenon is an example of frequency-dependent selection, where the fitness of a phenotype depends on its frequency relative to other phenotypes in a given population. In this case, the rarity of one sex makes it more valuable for reproductive success, leading to increased parental investment.

When Imbalances Occur in the Sex Ratio of Sexual Species