Scientists have been able to determine that everyone with blue eyes descended from one common ancestor.
The first blue eyes were due to a genetic mutation up to 10,000 years ago, before that everyone had brown eyes. The mutation affected the OCA2 gene which is involved in giving our eyes their pigment. "A genetic mutation affecting the OCA2 gene in our chromosomes resulted in the creation of a 'switch,' which literally 'turned off' the ability to produce brown eyes," said Hans Eiberg of the University of Copenhagen.
"A team of scientists has tracked down a genetic mutation that leads to blue eyes."
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