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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 collection of all the genes and the various alternative alleles within a population is called a gene pool. Genetic Variation within a population is measured according to the number of different alleles of all genes and the frequency with which they appear.ecombination (Crossing Over). This is the exchange of genetic material between adjacent chromatids on the homologous chromosomes. This random exchange of DNA results in many new combinations of alleles on chromosomes, creating great potential for variation.