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There is evidence that as many as 16 different genes could be responsible for eye color in humans; however, the main two genes associated with eye color variation are OCA2 and HERC2, and both are localized in chromosome 15. [10] The gene OCA2 (OMIM: 203200), when in a variant form, causes the pink eye color and hypopigmentation common in human ...
On the other hand, brown is the most common eye color. ... Eumelanin is a black and brown pigment, whereas pheomelanin is a red and yellow pigment. The interaction between the two types, along ...
A study of 1,023 students in Chile found that the most common eye color was brown-black: 71 to 89.4% and the most common hair color was brown from 65.8% to 66.8%. [8] In Spain, 57% are brown (7% of Spaniards are naturally blonde, 26% brunette, 3% redhead and the remaining 10% dark and light brown). [9]
Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7]
Melanin is the protein that creates skin, eye and hair color. More melanin means darker eyes, hair or skin. The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3 ...
The eye color is determined by the ommochromes. Ommochromes are also found in the chromatophores of cephalopods, and in spiders. [1] Ommochromes are metabolites of tryptophan, via kynurenine and 3-hydroxykynurenine. They are responsible for a wide variety of colors, ranging from yellow over red and brown to black.
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Eye injury and head trauma may also coincide with a black eye. Some common signs of a more serious injury may include: Double vision; Loss of sight and/or fuzzy vision could occur; Unconsciousness; Inability to move the eye or large swelling around the eye; Blood or clear fluid from the nose or the ears