How did human eye color develop?
How and when did human eye color appear. I mean blue eyes,green eyes,turquoise eyes,black eyes,brown eyes. Also why did humans develop eye color?
It is likely that when humans first evolved, they all had darker eyes – brown eyes. Irises are brown because they contain a lot of the pigment melanin.
The reason the iris contains melanin is the same reason why the skin does – it protects the tissue against damage from UV light.
Humans first evolved in Africa, where the sunlight is intense, so we would all have had dark skin and dark eyes.
If a mutation occurred which changed eye (or skin) colour, it would have been selected against, because having darker colouration in strong sunlight is an advantage.
When humans left Africa, mutations which change the colour of your eyes would no longer be disadvantages, and therefore would no longer be selected against. So humans with paler skin and differently-coloured eyes would start to appear.
Speed paint-human eye Color
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