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While eye color is often used as an example of autosomal recessive inheritance, the pigment of the iris is actually determined by the epistatic interaction of a number of different gene. Epistasis (Latin, "to stand upon") occurs when the expression of one trait is dependent on the expression of another. For example, if you have oculocutaneous albinism and don't produce enough melanin, you could have all the "dark iris" genes in the world and still be born with blue eyes. Also, there isn't a single gene that determines eye color - several different genes contribute, which makes sense when you think of the wide range of variation of this trait. Your brown eyes and your neighbor's brown eyes aren't the exact same, are they?
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