Neat finds about genes
All Blue-Eyed People Are Related To One Ancestor Who Lived 6,000 Years Ago
Researchers have tried desperately to get to the bottom of the eye colour, studying the OCA2 gene, which determines the level of brown pigment in the human eye, for many years. But they never found the answers they were looking for.
It turns out that the genetic mutation that results in blue eyes is from an entirely different gene, called HERC2, which completely turns off the OCA2, revealing the blue they were born with.
And, how do they know that it all links back to a common ancestor? Because every single blue-eyed person has the exact same mutation.