Anatomy Case Study on the Evolution of Skin Color

1194 words 5 pages
The main cause of Skin Cancer is exposure to the sun. Caucasians are more at risk for skin cancer because people with Darker Skin are more evolved to black out the sun. The age that Skin cancer typically occurs is after 50. The incidence of skin cancer is greater in older individuals. The amount of light reaches the North and South Poles in a predictable manner. The map shows all one color near the poles. The latitude that receives the greatest amount of UV light is the equator. Based on this information, the darkest pigmentation of skin is along the equator. The lightest Pigmentation of skin is near the poles. The more darkly pigmented skin will be near the equator because there is more UV light there, and the pigment …show more content…

Based on this new information, Having a certain skin tone has trade-offs. A lighter skin tone gets less Vitamin D, but has more folates. A darker skin tone has less folates, but absorbs more Vitamin D. A light skinned person living in the tropics would absorb Vitamin D but lose folates. A light skinned person living in a polar region would loose folates but gain Vitamin D. A dark skinned person living in the tropics would lose folates and keep Vitamin D. A dark skinned person living in the polar region would keep folates but lose Vitamin D. With all this in consideration, after our bodies change to our surroundings, our bodies will be ready to protect us and absorb whatever needs to be absorbed. Vitamin D cannot alone explain the distribution of skin color. Near the equator the skin will pigment itself darker to protect from UV light. This would help with absorption of Vitamin D, but folates would deplete. UV light, Vitamin D, and Folate needs do not explain the distribution of skin color, because you also need to factor in genetics. The Inuits might have migrated to the northern latitudes and not had a change in skin color yet, or they might have darker skin going way back in their genetics. The northern Europeans may not have evolved for their regions yet. The populations that has insufficient amounts of Vitamin D in their blood


  • Project on Ultrasound
    12337 words | 50 pages