Tracing Ancestry in DNA
Who: population geneticist Spencer Wells
What: Mutations caused by the transfer of DNA from two people.
Where: American
Whom: Ancient
How: Mutations are easiest to find in two places: in DNA that is passed from mother to child, and in DNA that travels from father to son Why: Geneticists can get a rough idea of where and when those groups separated in the great migrations around the planet.