If blue eyes are regressive (overridden by brown eyes) then, how could millions of north Europeans end up with blue eyes, supposing that blue eyes come from a single mutation?
In: Biology
Blue eyes aren’t an actual color. They are caused by a lack of melanin in the iris. Most Northerners have adapted to have low amounts of melanin probably to absorb more Vitamin D in lower light conditions. The eye color is a side effect of this, but it’s why these genes are so prevalent. They naturally selected it.
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