Study shows that people with blue eyes originate from the same ancestor
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Last Update: 2020-07-04
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Source: Internet
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Author: User
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A new studythe University of Copenhagen suggests that all blue-eyed people may have originated from a common ancestor, and that their blue-eye beads originated from a specific genetic mutation that occurred between 6,000 and 10,000 years agoThe color of human skin, hair and eyes is controlled by melaninScientists say it turns out that our eyes are brown, and then the genetic mutation, the difference in how much melanin in the iris leads to a differenceThe researchers compared blue-eyed people from different countries, including Jordan, Denmark and Turkey, to examine their mitochondrial DNAA particular gene mutation was found to form a gene switch that affects the expression of the OCA2 gene, the OCA2 gene-coded P protein, which is associated with the production of melaninThis mutation does not completely shut down the OCA2 gene, but rather accurately reduces the amount of melanin in the iris of the eye, which "dilutes" the brown of the eye ball to blueThe change of eye color from brown to green can be explained by the difference in the amount of melanin in the iris, and the special feature of blue-eyed people is that the change in the amount of iris melanin between all blue-eyed individuals is very small, compared with the difference between brown-eye individuals is relatively largeIt can therefore be speculated that all blue-eyed people may have inherited this gene mutation from the same ancestor(Liu County Book)
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