Mitochondrial DNA is passed from mother to children, both male and female, unchanged and it mutates at a predictable rate; i.e., the more the genetic mutations in the DNA, the more ancient the origin of the population.
Using these facts, some scientists are studying mitochondrial DNA to try to trace back the origins of the human race.
Using this method, the scientists have traced the human race to one female in Africa several million years ago. Then they traced the migration patters of her descendants as they spread across the earth.
The Real Eve is a fascinating documentary presenting a new and controversial theory of human evolution. It does what all good documentaries do, it makes you think, and it entertains at the same time.