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Genetic variation is stored in a population's gene poolâthe combined alleles of all of the individuals in a population. allele frequency An allele frequency is a measure of how common a certain allele is in the population.
Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population. Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organismâs offspring).