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Old Thu Mar 26, 2009, 06:01pm
BillyMac BillyMac is offline
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Quote:
Originally Posted by Mark Padgett View Post
What is most disheartening is that people still have preconceived notions about something they refer to as "race". The genome project proved scientifically there is no such thing as far as science is concerned. What humans share is commonality of genetic tagging. For example, genetically, being a white male I share more genetic traits with a black male than I do with a white female. This fact throws the concept of "race" right out the window.
Mitochondrial Eve is the name given by researchers to the woman who is defined as the matrilineal most recent common ancestor for all currently living humans. Passed down from mother to offspring, her mitochondrial DNA is now found in all living humans: every mtDNA in every living person is derived from hers. Mitochondrial Eve is the female counterpart of Y-chromosomal Adam, the patrilineal most recent common ancestor, although they lived at different times. She is believed to have lived about 140,000 years ago in Eastern Africa: specifically, in what is now Ethiopia, Kenya, or Tanzania. Mitochondrial Eve is the MRCA of all humans via the mitochondrial DNA pathway, not the unqualified MRCA of all humanity. All living humans can trace their ancestry back to the MRCA via at least one of their parents, but Mitochondrial Eve is defined via the maternal line. Therefore, she necessarily lived at least as long, though likely much longer, ago than the MRCA of all humanity. The existence of Mitochondrial Eve and Y-chromosomal Adam does not imply the existence of population bottlenecks or a first couple. They each may have lived within a large human population at different times.
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