There is one aspect of mtDNA testing that I do not understand. If you are looking at the non-coding region how is it that this one ancestral female came to be the mother to the entire population? Wouldn't there have had to be some kind of survival advantage conferred for the frequency of a spontaneous mutation to completely replace the prior existing type?

Certainly you are not suggesting that these populations evolved independently based on a snippet of dna and the assumption that mutations don't happen very often.

BTW not picking a fight just asking questions.
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