In this clip of Finding Your Roots, journalist Nina Totenberg and talk show host Andy Cohen build on what they learned through document research, using DNA testing to explore their family trees. This lesson explores the contribution of DNA in creating human variation. Human diversity is affected by many factors, such as the environment we grow up in, our life experiences, as well as our DNA. The study of DNA shows us how genetic variation contributes to human diversity and, at the same time, how much we have in common.

Support materials were created by the Personal Genetics Education Project (pgEd).