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Every blue-eyed person on earth is a descendant of one person

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Every blue-eyed person on earth is a descendant of one person

Your family may be bigger than you think

Scientists believe that all blue-eyed people are descended from the same people who lived about 6,000 to 10,000 years ago.

While 70 to 79 percent of the world's people have brown eyes (the most common color), only 8 to 10 percent have blue, the second most common color.

According to the American Academy of Ophthalmology (AAO), about 10,000 years ago, everyone on Earth had brown eyes.

A research team from the University of Copenhagen has discovered that blue-eyed creatures all come from the same person. Years ago, researchers tried to figure out what caused eye color changes by studying the OCA2 gene, which determines the levels of brown pigment in the human eye.

The study, published in 2008, found that the genetic mutation that causes blue eyes actually comes from an entirely different gene, HERC2. This gene completely turns off the OCA2 gene and fades brown eyes to blue.

Scientists realized that everyone with blue eyes had the same mutation, leading them to believe they were all descended from the same person. It's thought the mutation may have spread as humans migrated from Africa to Europe – although there's still plenty of research to be done.

The researchers also looked at less common eye colors, such as green, which allowed them to understand why people have that color of eyes, and also supported the idea that a person is genetically originated from blue eyes.

Study author Professor Hans Eiberg from the Department of Cellular and Molecular Medicine tells us Science Daily: “Meanwhile, people with green eyes could be explained by the fact that they have reduced amounts of melanin in their irises, which is very different from people with blue eyes.”

“From this, we can conclude that all blue-eyed individuals are related to the same ancestor. They all inherited the same switch at the same location in the DNA,” he added.

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