Frank Sinatra's were legendary, Paul Newman's melted a million hearts while Cameron Diaz's dazzle in modern Hollywood. But how - and why - blue eyes arose has always been something of a genetic mystery. Until now. According to a team of researchers from Copenhagen University, a single mutation which arose as recently asyears ago was responsible for all the blue-eyed people alive on Earth today. The team, whose research is published in the journal Human Genetics, identified a single mutation in a gene called OCA2, which arose by chance somewhere around the northwest coasts of the Black Sea in one single individual, about 8, years ago. The gene does not make blue in the iris; rather, it turns off the mechanism which produces brown melanin pigment. And most people still do. The finding that a rare mutation, probably dispersed in the rapid wave of colonisation that followed the end of the last ice age, highlights one of the great mysteries of human evolution: the oddness of Europeans. Those from Europe and the Near-East have many characteristics that set them apart from the rest of the human race.
Why do people with blond hair as a rule have blue eyes? You might additionally notice that people with brown beard typically have brown eyes. Skin color also often fits in this trend: people with lighter hair and casing often have light eyes. And ancestor with darker hair and skin as a rule have dark eyes. The color of our hair, skin, and eyes is determined by the same thing: the amount of pigment they have. The pigment that causes dark hair, casing, and eyes is called melanin. Melanin is made in special cells all the rage the body called melanocytes.
Erstwhile insights Overview In the array of possible natural hair colors, dark hues are the most common — add than 90 percent of people all-inclusive have brown or black hair. Burgundy hair, occurring in just 1 en route for 2 percent of the population, is the least common. Blue eyes are similarly uncommon, and they may be becoming rarer. One study found so as to between andmore than half of non-Hispanic white people in the United States had blue eyes. But from tothat number fell to Today, estimates advise about 17 percent of people all-inclusive have blue eyes. Your hair color and eye color come down en route for what genes you inherit from your parents. You must inherit two sets of genetic information for both your hair color and your eye color to have these less-common characteristics. The likelihood of this happening is absolutely rare, especially if neither of your parents has red hair or azure eyes.
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