If You Have Blue Eyes You Share Ancestor With Jake Gyllenhaal
1 A Single Ancestor’s Genetic Mutation = Blue Eyes According to scientists, every blue-eyed person on Earth can trace their ancestry back to a single person who lived in Europe between 6,000 and 10,000 years ago. At one point, every human had brown eyes—until a mutation developed on the gene HERC2. Scientists say it switches off OCA2, another gene that regulates the amount of brown pigment that develops in the eye....