The Effects of Hair and Eyes by Melanin

Do you know why huskies have blue eyes? Scientists had DNA tests on more than 6000 huskies. The result of why huskies have blue eyes is duplication on carbine chromosome 18 is strongly associated with huskies. Like this, our hair and eye colors are different to humans to humans. Our hair and eye colors are different to humans because of melanin. Here are some pieces of information about how we get hair and eye colors.

Let us talk about how we get hair colors. We get different hair colors because of melanin. Melanin is a broad term for a group of natural pigments found in the most organisms. Melanocortin 1 Receptor which is MC1R is the one that changes the colors of hair. There are three types of melanin. They are eumelanin, pheomelanin, and neuromelanin. Eumelanin causes hair to get dark colors. It also gives protection of skin from ultraviolet radiation. Pheomelanin causes hair to get light or red. Neuromelanin has no relationship to hair colors. Human hairs can be five colors. They are white, gray, brown, black, blond, and rarely red. Black colors can be mostly seen in Asia and Africa. When it is black/brown, it means that MC1R is active. Blond colors can be mostly seen in Europe. When it is blond, it means that MC1R is inactive. Red colors are rare to appear. Red colors are seen in northern Europe such as in Britain and Ireland. White colors have two kinds of melanin. They are pheomelanin and eumelanin.

People have different eye colors for the same reasons. It is melanin. Eye colors can have five colors. They are brown, green, hazel, gray, and blue. Dark colors such as gray and brown are formed because of the higher level of pigment. Light colors such as blue and green are formed because of the stroma. Stroma is a layer of iris performs an effect called scattering of light.