Wikipedia:Today's featured article/July 28, 2004

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A comparison of the mitochondrial DNA of humans from many races and regions suggests that all of these DNA sequences have evolved molecularly from a common ancestor sequence. Under the assumption that an individual inherits mitochondria only from his or her mother, this finding implies that all living humans have a female line of descent from a woman who researchers have dubbed Mitochondrial Eve. Based on the molecular clock technique, Eve is believed to have lived about 150,000 years ago. At the time of Eve's existence, there may have been up to 20,000 individuals. Phylogenies suggest she lived in Africa.

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