Human beings are no exception to biological evolution. Like other organisms around the world, humans have significantly changed overtime and have developed all sorts of diverse characteristics. One noticeable characteristic of human beings is the variation of skin color. Skin color has been used to identify, classify, and verify the variation that exists in the human population around the world. How did such a distinct variation arise and how did it play into adaptation?
I’ve often heard that “humans came from monkeys,” or something similar. It is true that humans’ ancestors were primates, who first resided in warm and sunny Africa; they had similar features to today’s apes, such as a hairy body. The purpose of the vast amount of hair was to protect the body from the sun’s ultraviolet (UV) rays and to prevent overheating, mainly by acting as a barrier for the skin underneath the hair (Jablonski, 598). Some parts of the body such as palms were not covered with hair, but with sweat glands. Sweat glands allowed the body to cool off via evaporation at the surface of the skin; sweat glands were more efficient at thermoregulation. Overtime, early humans with a high amount of sweat glands were selected for since they had the best method at the time to keep themselves cool in warm environments (Kirchweger). This meant that overtime, humans lost most of their hair on their bodies, leaving their skin exposed. Sweat glands were going to help the body to cool down, but they couldn’t protect the skin from harmful UV rays. This is where melanin worked its magic, and it’s the reason for the diversity in skin color today.
Melanin helps reduce the absorption of wavelengths into the skin (Chaplin, Jablonski, 59). The more melanin in the skin, the greater the protection against harmful UV rays, and the amount of melanin in the skin correlates with the skin’s color (more melanin means darker skin)....
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...m all over the world, with all hues of skin colors. With interracial dating and marriages and more “mixing” of skin colors, there are multiracial children with various skin colors. Genetically, it enhances variation within the individual, but what about variation within the species? I heard a joke once that eventually in the future, everyone will be beige. Will everyone mix together to an extent that there will be little to no variation anymore, at least skin deep? It’s an interesting concept to think of. At the moment, I believe that there is enough diversity within the human species that we don’t need to worry about the lack of variation in the near future. For now, we can appreciate the diversity of skin colors that has allowed our ancestors to adapt to their environments and survive. It has allowed them to create a lineage of who we are today.
1) Chaplin, G. Jablonski, N. “The Evolution of Human Skin Coloration.” Journal of Human Evolution 39 (2000) 57-106
2) Jablonski N. “The Evolution of Human Skin and Skin Color” Annual Reviews Anthropology 33 (2004) 585-623
3) Kirchweger G. “The Biology of… Skin Color” Discover 22 (2001)
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