Scientists from the University of Copenhagen supposed that blue eyes appeared as a result of a certain genetic mutation. It occurred about 6,000 – 10,000 years ago. The study was conducted among residents of Jordan, Denmark, and Turkey.
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Initially, all people had brown eyes, according to scientists. Then there were green ones – the color depends on the amount of melanin in the iris. However, soon there was a mutation affecting one of the genes in the chromosomes, which is responsible for the ability to "produce" brown eyes. As a result, another “switch” gene appeared next to it, reducing melanin production and leading to the substitution of brown eyes with blue ones.