Frequency-dependent selection is the term used for an evolutionary process in which the fitness of a phenotype depends on its frequency relative to other phenotypes in a given population. Frequency-dependent selection is mainly the resultant of species interactions such as predation, parasitism, or competition or between genotypes within species (usually competitive or symbiotic). Frequency-dependent selection can lead to polymorphic equilibria, which result from interactions among genotypes within species, in the same way that multi-species equilibria require interactions between species in competition. In positive frequency-dependent selection, the fitness of a phenotype increases as it becomes more common and in negative frequency-dependent selection, the fitness of a phenotype increases as it becomes rarer.
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Last date updated on June, 2014