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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.
Genetic variation refers to genetic differences both within and among populations. There may be multiple variants of any given gene in the human population (alleles), leading to polymorphism.he main cause is genetic drift, this is the effect of random changes in the gene pool. In humans, founder effect and past small population size (increasing the likelihood of genetic drift) may have had an important influence in neutral differences between populations.