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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 genetic material is stored in the form of DNA in most organisms. In humans, the nucleus of each cell contains 3 Ã 10 9 base pairs of DNA distributed over 23 pairs of chromosomes, and each cell has two copies of the genetic material.