preview

Nina G. Jablonski's Skin Deep

Decent Essays

In the article, Skin Deep by Nina G. Jablonski and George Chaplan, the authors are attempting to explain how the human skin color has evolved to be dark enough to prevent sunlight from destroying folate but light enough to enhance the production of Vitamin D. The changes in skin pigmentation have evolved since the age of Lucy, who is a skeleton of the ancient humans that is about 3.2 million old. Lucy is being used to determine where and why our ancestors began changing in skin pigmentation. The theory according to Peter Wheeler of John Moores University in Liverpool, England is that the skin of humans adapted to fit the needs at that time. His theory is that back then humans had to stay cool and protect themselves from the extreme heat. This was accomplished by the increase in sweat glands on the surface of the body and reducing the amount hair on the body. However, once the hair was lost another issue became important: the issue of protecting the skin from the sun and its detrimental effects. One of the damaging effects of the sun discussed …show more content…

The longest skin color that was able to adapt was those of the indigenous people of Africa, due to the fact that the first modern humans evolved from the same areas. Within the African continent there are variations of skin color. The Khoisan, which were on the earliest colonizers, are found in Southern Africa and have lighter skin than those who live in equatorial Africa. This is due to clear adaptation of the lower levels of UV radiation in the southern portion of the continent. Yet, it doesn't appear that skin colors of those who live in Southern Africa are uniformed. The skin-color differences between the Khoisan and Zulu comes to show that the amount of time that a group inhabits an area also plays a great role in how light or how dark their skin color

Get Access