Blue Human Eyes at Anatomy

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Blue Human Eyes. 9 in humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in the iris pigment epithelium (located on. When it comes to the history of basic human traits, an evolutionary myth about eye color often pops up.

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Blue is the second most common type of eye color on earth in humans. Blue eye color is determined by melanin, and melanin is actually brown by nature. The front transparent part of the sclera is called cornea.

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Inbreeding stacks the odds of being born with such conditions against you. This is important as certain congenital defects and genetic diseases, such as cystic fibrosis, are carried by recessive alleles. The research showed that those who have blue eyes have a single common ancestor. Originally, all humans had brown eyes.