Natural selection favouring the rarer sex in a population leads to evolution of sex ratios. This process is the result of

Question

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Frequency-dependent selection occurs when the fitness of a particular phenotype depends on its frequency relative to other phenotypes in a given population. In the case of natural selection favouring the rarer sex, it means that the fitness of the rarer sex increases as its frequency decreases relative to the more common sex. This leads to a shift in the sex ratio towards the rarer sex, resulting in the evolution of sex ratios. This is because the rarer sex has a higher reproductive success due to reduced competition from members of the same sex. Therefore, frequency-dependent selection is the best choice to explain this process.

Natural Selection Favouring the Rarer Sex in a Population Leads