No two people are genetically identical, except for identical twins. The main source of genetic variation among human individuals is

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The main source of genetic variation among human individuals is the reshuffling of alleles in sexual reproduction. During meiosis, the genetic material from the mother and father is randomly combined to create a unique set of alleles in the offspring. This process is responsible for the majority of genetic variation in a population. Mutations, genetic drift, natural selection, and environmental effects can also contribute to genetic variation, but they are not the primary source.

No Two People Are Genetically Identical, Except for Identical Twins