If blue eyes are a recessive gene and green eyes are a dominant gene, why are there more people with blue eyes?
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Green is tricky because it has a more difficult genetic recipe.
Blue eyes – nothing is added, the blue is from light scattering unimpeded.
Brown eyes – lots of melanin, amount of melanin is what decides how brown the eyes are.
Green eyes – a small amount of melanin + yellow pigment called Lipochrome.
Hazel eyes – same as green eyes but more melanin.
Hazel and Green are on a spectrum determined by the amount of melanin present. And since brown eyes are the most common eye color in humans, there’s usually a higher concentration of melanin in the genetic soup so eyes will be more hazel then green. Since green eyes have only a small amount of melanin, it becomes more rare.
Multiple genes are responsible for eye color, so it’s very complex.
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