Having blue eyes is a genetic mutation that results in the body's inability to produce melanin to make eyes brown, which is the natural color. Between 6000 to 10000 years ago, a genetic mutation occurred that made a single human person lose the ability to make brown eyes.
Their research showed them that people with blue eyes from all around the world have the same gene changes that are linked to the one mutation that makes their eyes blue. Brown eyed people have different genes in that same DNA strand, so they believe that this indicates blue eyed people all come from the same ancestor!
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