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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.
In genetic terms, evolution is any change in the allele frequency in a population. Sources of Genetic Variation The three main sources of genetic variation are mutations, genetic recombination during sexual reproduction, and lateral gene transfer. A mutation is any change in a sequence of DNA.n genetic terms, evolution is any change in the allele frequency in a population. Sources of Genetic Variation The three main sources of genetic variation are mutations, genetic recombination during sexual reproduction, and lateral gene transfer. A mutation is any change in a sequence of DNA.