Genetic variations

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Up to 16 genes control eye colour.

Origin of blue eyes
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Origin of green eyes
The Caucasian mountain area seem to be the point of origin where blue eyes from the south mixed with brown eyes from the north.
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Only 2% of the people in the world have green eyes. This makes it the rarest eye colour in the world.
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The green colour is produced due to the Rayleigh scattering of light in the top layer, or stroma, of the iris, with low levels of melanin in the iris. The blue effect of Rayleigh scattering combined with the brown melanin causes the eye to appear green.
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Origin of white skin

Origin of red hair

Origin of blonde hair

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