Hello, I'm an expert in genetics and human biology. When it comes to the
rarest eye color in the world, there are a few contenders, but the color that is often considered the rarest is
green. Green eyes are the least common eye color globally, with estimates suggesting that only about 2% of the world's population has them.
Green eyes are caused by a combination of two types of melanin, the pigment that determines eye color. The specific genetic factors that result in green eyes are not as well understood as those for other colors, but it is known that they are a recessive trait, meaning both parents must carry the gene for green eyes to have a child with green eyes.
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