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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.
The size of the gene pool is a direct measure of the amount of genetic variation. What happens if the gene pool gets smaller? If the gene pool of a population gets smaller you are stating that the amount of genetic variation of a population goes down. In itself this is not bad and it is happening all the time, as natural selection filters out some genetic variation.