Variation in mtDNA among modern humans suggests that

Question

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mtDNA is inherited only from the mother, so all individuals of a certain ancestral line will have the same mtDNA. This suggests that all modern humans inherited their mtDNA from a single woman, often called "mitochondrial Eve," who lived about 200,000 years ago. It does not necessarily imply that all humans are descended from a single man (choice A), that we are more genetically variable than other species (choice B), or that we underwent a recent population collapse (choice C).

Variation in MtDNA Among Modern Humans Suggests That