Skin Cancer in Canda Although it\'s not possible to gather data on skin cancer i

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Skin Cancer in Canda Although it's not possible to gather data on skin cancer in early hominins, modern data on skin cancer provide some helpful information. There are 2 main types of skin cancer. In most cases, non-melanoma progresses slowly and doesn't spread to other parts of the body. According to the Canadian Cancer Society, in 2009, 75, 100 Canadians were diagnosed with non-melanoma skin cancer, but only 270 people died of this disease. The median age of diagnosis for non-melanoma skin cancer is 60. In contrast, melanoma skin cancer can be fatal if it's not treated early on. However, according to the Canadian Cancer Society, only 5,000 new cases of malignant melanoma were diagnosed in 2009. Of these, 940 people died. Although it can strike at different ages, the median age of diagnosis of malignant melanoma is 59. Skin cancer risk increases with UV light exposure, and light skinned Caucasians have a higher incidence of skin cancer than other ethnic groups in Canada. Evolution of Skin Color - The Alternative Explanation In recent years, many people have challenged the conventional view that skin cancer risk alone explains global patterns in the distribution of human skin color. Use the data on skin cancer in Canada to explain why risk of skin cancer might not be a sufficient explanation for the distribution of skin color in indigenous populations.

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Explanation: Risk of skin cancer might not be a sufficient explanation for the distribution of skin color. If skin cancer risk alone could explain the global patterns in distribution of human skin color, then we except natural selection ( as a result of adaption to the different levels of UV radiation at each latitude) to occur. However, because the most common form of skin cancer, non-melanoma is not an extremely fatal disease and would kill the individual after reproductive age, it allows the passing on of genes damaged by radiation and genes that result in an undesired phenotype (phenotype atrributed with high risk of skin cancer). Melonoma is a fatal type of skin but affect only a small portion of population this type of cancer is fatal usually after reproductive age.

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