World Science is reporting on a study indicating that blue eye color was a mutation that took hold some 6 to 10 000 years ago.
“Originally, we all had brown eyes,” said one of the researchers, Hans Eiberg. But a mutation affecting a gene called OCA2 “resulted in the creation of a ‘switch’ which literally turned off the ability to produce brown eyes.”
A bit further comes this gem, which shows the power of evolution in populations.
The mutation of brown eyes to blue is neither positive nor negative, Eiberg said; rather, it’s one of several mutations such as hair colour, baldness, freckles and beauty spots, which neither raise nor reduce a person’s survival chances. “It simply shows that nature is constantly shuffling the human genome,” he said, “creating a genetic cocktail of human chromosomes and trying out different changes.”