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

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Frequency-dependent selection occurs when the fitness of a phenotype depends on its frequency relative to other phenotypes in a given population. In this case, the minority sex receives more resources, which can increase its fitness, demonstrating negative frequency-dependent selection.

When Imbalances Occur in the Sex Ratio of Sexual Species