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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 being generated all the time, from mutation, recombination by virtue of sexual reproduction, and by the action of viruses and transposons. Genetic variation will also be preserved by virtue of variation within the environment. A species may inhabit a geographical range with a range of environmental conditions. Sub-species will tend to emerge, adapted to those particular environmental conditions.