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Can identical twins have different eye color?

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Yes, but rarely. Forget what you learned in bio class (well, just this part for now - most of the rest is probably pretty useful). Eye color is not 100% genetic. The drug Latisse (used to treat glaucoma or to grow longer/thicker eye lashes) is known to turn blue eyes brown. read more

Genetically identical twins can have different eye colors because DNA sequences don’t determine traits. Modern science has revealed epigenetic mechanisms that regulate characteristics of organisms. Eye and pigment color is mostly affected by melanin production associated genes, such as OCA2, HERC2 and SLC45A. read more

If the egg splits to form identical twins, those sides become independent, and mirror twins result. Among the Jepp girls, for instance, three are right-handed, the other is a leftie. Of course, our own boys have their share of similarities. Their eyes are an identical bright blue. read more

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Why do people have different eye colours?
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