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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.
1 Gene flow is any movement of genes from one population to another and is an important source of genetic variation. 2  Sex can introduce new gene combinations into a population. 3  This genetic shuffling is another important source of genetic variation.ithout genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation, which we will learn more about: