Different Colored Eyes Day 2018 is on Thursday, July 12, 2018: Serious Question; two different colored eye?
Thursday, July 12, 2018 is Different Colored Eyes Day 2018. Gallery: Happy Different Colored Eyes Day TheGloss Different Colored Eyes Day
Different Colored Eyes Day remembers people whose irises will vary colours. Eye colour is controlled through the amounts of melanin contained in the iris, as well as in rare cases this could vary between individual eyes, producing a person getting two different coloured eyes.
That's not true. A twin has their own DNA and you have your own DNA. The twins are just sharing the same womb, not each other bodies. If they're conjoined together, often time when one dies the other died too if they're sharing the same blood flow. That movie is creative, but it's false.
The color of your eye is produced melanocytes in the iris and is inherited by your parents, and they can often "change" by the exposure of light. Your Blue eyes contain low amounts of melanin within the iris stroma; longer wavelengths of light tend to be absorbed by the underlying iris pigment epithelium, and shorter wavelengths are reflected and undergo Rayleigh scattering. Therefore, a dominating color such as brown can show up.
Why do we have different color eyes?
You are on the right track. Those of us with ancestors in areas where the sunlight is more direct (nearer the equator) or where the conditions of glare and wind are harsh (Arctic/Asian) have darker eyes to protect from the greater amount of sunlight, either directly or from the glare off of snow. Snow glare is intense; don't let the latitude fool you. This is also how people of Asian origin got epicanthic folds on the upper lids of their eyes. It helps to protect the eyes from the glare (think Siberia or Mongolia) and the wind extremes.
Those of us whose ancestors came from more moderate latitudes where the sunlight is not as extreme and there tends to be more cloudy days needed less melanin, or coloring, in the pupils because there was less direct sunlight, so light eyes were favored.
The same holds true with skin color. Those people living in harsher climates, be it equatorial or far northern climates, needed more melanin in their skin to protect from the UV radiation of the sun. You know how fast light skin burns, and we now know that skin cancers are directly connected with exposure to too much UV also. More melanin in the skin helps shield the cells, but it is not foolproof. However, by natural selection, more melanin meant better adaptability to those climates. That's why Eskimos and Native Americans have dark skin as well; the theory is that Native American people crossed from Mongolia across the land bridge into what is now Alaska, and then moved down into Canada and the US. By natural selection, the darker skin and eyes assisted the eskimos in protecting them from the harsh weather conditions and the glare of sunlight off of snow and ice. The Native Americans have darker brown skin (not RED) because of their ancestry and also because the conditions on the plains of Canada and the US are very harsh too. The glare of the sun in the summer is fierce and the temperature gets to triple digits Farenheit, and in the winter the winds are harsh and the temperatures can dip to well below zero Farenheit with fierce winds. The melanin in the skin and eyes (and hair too) helped their ancestors by protecting them from that.
Fun fact: The Lakota (Sioux) call March the Moon of the Sore Eyes, referring to snow blindness. The snow cover and the higher March sun causes huge glare, and in the old days of the tipi, the inside of the tipi was dimly lit by the central fire while the outside in daytime was a huge white glare, and so it was difficult for them to see until their eyes adjusted to the different light. Just a fact to illustrate how harsh conditions can be in the Great Plains of North and South Dakota, but that's why there is more melanin in general in the coloration of the Native American.
I hope this helped. It isn't just latitude, it's also the weather conditions at those latitudes that favored more melanin in the skin, hair and eyes of people whose ancestors come from either equatorial areas or far northern areas. There are theories that the Maori people of New Zealand may have migrated there by boats from the Antarctic area, which would be the southern equivalent of this theory. New Zealand is moderate and rainy, but the alleles from the ancestors are strong in the Maori people, and indicate an origin elsewhere.
How many colors are there in your eyes!?
My Eyes are different colours on different days !! People say there green, some say there blue & sometimes they say there hazel ??? But myself, I say I'm the Green Eyed Monster !!!