albinism, which affects about 1 in 18-20,000 people in the US. Globally, genetics experts believe that albinism occurs in nearly 1 in 3,000 people.
ADVERTISEMENT Researchers found that melanin levels in the iris cause variation from brown to green eyes. However, humans with blue eyes only have a slight variation in melanin in their irises.“From this, we can conclude that all blue-eyed individuals are linked to the same ancestor,” says Professor Eiberg. “They have all inherited the same switch at exactly the same spot in their DNA.” On the other hand, brown-eyed individuals have significant individual variation in the parts of their DNA that govern melanin creation.
ADVERTISEMENT Professor Eiberg and his colleagues studied mitochondrial DNA. Then, they compared the eye color of blue-eyed individuals from Jordan, Denmark, and Turkey.
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