As an expert in human genetics and biology, I can provide you with an informed answer regarding the rarity of eye colors in humans.
The
rarest eye color in humans is generally considered to be
green. Green eyes are the least common eye color worldwide, with estimates suggesting that only about 2% of the world's population has this eye color. The rarity of green eyes is due to the specific combination of genes required to produce this color. The
gene responsible for eye color is located on chromosome 15, and the specific
alleles or variations of this gene determine the color of the eyes. Green eyes are the result of a
recessive gene, meaning that both parents must carry the gene for green eyes to have a child with green eyes.
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