In some contexts two or more heritable variants evolve in a population. This is called

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Frequency-dependent selection refers to the phenomenon where the fitness of a phenotype or trait depends on its frequency in a population, meaning that the more common the trait is, the lower its fitness and the less common the trait, the higher its fitness. This can lead to the evolution and coexistence of multiple heritable variants in a population.

In Some Contexts Two or More Heritable Variants Evolve in a Population