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Why do some people have blue eyes while others have brown?

What genetic or cellular factors determine the color of a human iris, and why are brown eyes the most common globally?

G
GeneticsFan
asked 22d ago · 10 rep

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Eye color is determined by the amount and distribution of melanin pigment in the iris. Brown eyes have high melanin, which absorbs light. Blue eyes have almost no melanin; they appear blue due to the Rayleigh scattering of light in the stroma.

B
BioExpert answered 22d ago

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