Bryan Sykes

Geneticist Bryan Sykes discusses examining America, one of the most genetically diverse countries in the world, through its DNA, and what it says about how we perceive race. His book DNA USA: A Genetic Portrait of America takes readers on a historical genetic tour, interviewing genealogists, geneticists, anthropologists, and everyday Americans about their ancestral stories.

The United States has just over 300 million people. If you break that down to a biological level, that equals about 13.8 billion human chromosomes, and at least 90 trillion human gene...