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

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The reshuffling of alleles in sexual reproduction (also known as recombination) is the primary cause of genetic variation among individuals. During meiosis, homologous chromosomes exchange genetic material, resulting in offspring with unique combinations of alleles. Mutations and genetic drift can also contribute to genetic variation, but they are not the chief causes. Geographic variation and environmental effects can influence the expression of certain traits, but they do not directly cause genetic variation.

No Two People Are Genetically Identical, Except for Identical Twins