Mitochondrial Eve is the "most common recent ancestor of all humans alive on Earth today with respect to matrilineal descent" (
Source). Unlike other DNA, mitochondrial DNA is not combined with the DNA of the father. Variations in this particular DNA stem directly from genetic mutations. She is calculated to have lived in Africa 150,000-200,000 years ago (
Source).
http://ngm.nationalgeographic.com/print/2006/03/human-journey/shreeve-text
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