Some years ago the theory was propounded, based on studies of mitochondrial DNA passed only from mother to daughter, that all humanity was descended from one woman who lived somewhere in Africa about 200,000 years BPE.
However, just yesterday we watched a program on the National Geographic channel which said that, based on Y chromosomes passed only from fathers to sons, all men were descended from a “scientific Adam” who lived about 60,000 years BPE in East Africa. The narrator consistently said all men, and not all humans, were descended from this one individual.
So…can these two ideas be reconciled, or has the “mitochondrial Eve” theory been disproved? As I see it, mitochondrial Eve could have been with a number of men to produce her descendents, and ultimately us. Y-chromosome Adam probably had a number of women in the course of his life, producing his descendants, and ultimately us. But this implies that there must have been two severe population bottlenecks, one 200000 years ago and the other 60000 years ago, when the human species was in danger of dying out. Or does it? Can anyone comment on this?