Red Pink Yellow
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Why people do NOT have pink, yellow, purple, red or orange eyes?
I am curious. PLEASE answer this question and BE serious. I thing this is a very IMPORTANT question.
I'm no scientist, so someone more generally informed may suit your question better, but here's my take on it.
Eye color is determined by the present, or more accurately, dominant pigments. (By the way, people and animals with albinism, that is lack of pigment, do have red eyes because there is no pigment so you see straight to their blood cells!) These pigments are typically genetic, but some eyes can become a mix of pigments. Hazel eyes for instance heavily carry the pigments for green or brown eyes but contain traces of lipochrome which causes yellow to appear. When that happens, what we see is "hazel." *According to Wikipedia, "although hazel eyes may contain specks of amber or gold, they usually tend to comprise many other colors, including green, brown and orange" and "hazel tends to be duller and contains green with red/gold flecks." So some colors are possible to be present (they mentioned red, gold, and orange), but they're usually recessive.
Also, since the mixture of these pigments will give us hazel eyes, it might be possible that if you took someone with pink, and somene with orange, you'd get brown. The mixture of the recessive traits could create the typical colors we see today.
*Note, like I said, albinism is the LACK of pigments, and the red in the eyes is the bloodcells we see, literally THROUGH the clear iris. So even if someone with red albino eyes were to have babies with someone with blue eyes, they wouldn't have a chance in heck to produce kids with purple-pigment eyes.
However, another possibility is that people at some point in early history, B.C.E., might have had some of those as natural colors. But they never got passed down into the gene pool enough to make it to us today. Why could this be? Well, it's known that blue eyes and albino eyes are more sensitive to light than those with browns or greens. So, if we go with this theory, then we could probably assume that there was a decisive dissadvantage to having pink or purple eyes. Maybe they were too sensitive to the light to effectivly hunt and would either starve or not see well enough in the day and maybe end up becoming the prey themselves or stumbling off a cliff because they couldn't see the edge! These people couldn't survive and the genes died out and/or became recessive (which would account for the yellow part of hazel eyes. It's possible to have it, but it's not a dominant trait and thus we never really see it as the main color.) Or maybe these was something people found unattractive about these eyes, and so they couldn't pass them on because no one wanted to risk their children having it. I'm not sure if cavemen were /that/ smart, but it's possible--animals decide on mates for a number of reasons, I'm sure it goes without saying that these colors were possibly deemed "unattractive" and so the ladies could have wanted their men to have baby blues instead of pretty pinks for some reason or another.
I'm sure in the future, when we have the technology, you could change a fetus' genes to give it a "natural" purple eye, or we can open up the (possibly) locked-away traits and reintroduce them into the gene pool, but the truth is at this point not every gene that determines eye color has been found, so the real answer might not be known for decades.
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March 2nd, 2008 in
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