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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.
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population.Because of this, mutations are usually selected against through evolutionary processes.ene flow is the movement of genetic information between different populations. This method increases genetic variation because introducing new alleles into a population increases the amount of diversity. The more alleles available in a population, the more variation that can occur.