This study reveals that the mitochondrial diversity of a given animal species does not reflect its population size: No correlation between mtDNA polymorphism and species abundance could be detected, despite the large body of data analyzed.
This comes from a paper that John Hawks links to and discusses.
That sure implies to me that if the discussions of humanity going nearly extinct are based on mtDNA we might want to rethink that. Of course, if its based on nuclear DNA, I'll shut up and sit down.
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