Redheads, as they say, wear the map of Ireland all over their faces. Sorry, ginger-haired English Prince Harry. Ireland has the highest per capita percentage of redheads in the world -- anywhere from 10 to 30 percent, according to Eupedia , a website that explores European genetics and ancestry. They are almost equally prevalent in Scotland and other pockets of Celtic pride.
How Common Are People with Red Hair and Blue Eyes?
30 Shocking Facts About Redheads You Never Knew of !
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You Got the Luck of the Irish: You’re a Redhead!
And when you meet a red head with blue eyes, you are looking at the rarest colour combination of all for human beings. Around 17 per cent of people have blue eyes, and when combined with per cent having red hair, the odds of having both traits are around 0. The reason these looks are so unusual is because they are the result of two different sets of DNA instructions, or mutations, happening in the same person, explains Professor Mark Elgar, an evolutionary biologist from the University of Melbourne. In contrast, brown hair and brown eyes are dominant traits, which is why they are much more prevalent. In some regions of the world, red heads are more common, making up per cent of the population in Scotland and Ireland for example.
No one knows for sure why this is. There isn't any evidence that the DNA changes that cause red hair also affect eye color. Or vice versa. And the two aren't genetically linked like some other hair and eye colors. For example, blonde hair and blue eyes are known to be linked.