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An example of genetic variation is like sickle cell anemia. Sickle cell anemia is a mutation but is adaptive where malaria exists, like in Africa, it helps fight off the disease. But in a place like America it is not adaptive so its less common.
Variation is high when there are many different alleles of all genes and when there are many different combinations of those alleles. However, genetic variation is constantly changing. Different alleles of a single gene can appear and disappear from time to time within a group.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.