Mitochondrial DNA will be passed from mothers to children, both male along with female, with no changes and mutates at a predictable rate, since the origin of the people.
Using these facts, some scientists are mastering the mitochondrial DNA to try and trace the origins from the human race.
Using this method, scientists have mapped people to a woman in Africa millions of years ago. Then they traced the migration patterns in their descendants are spread through the land.
The Real Eve is really a fascinating documentary that offers a controversial new hypothesis of human evolution. It does what all good documentaries try to do: it makes you think and entertains while doing so.