The graph in Figure 2 (below) summarizes the age at which people are diagnosed with melanoma, the most serious form of skin cancer. Use the graph to explain why protection from skin cancer may not explain the strong selective pressure for dark skin in high-UV areas. Percent of New Cases by Age Group: Melanoma of the Skin 30 25 22.1% 21.1% 20 16.9% 16.8% 15 10 8.9% 6.0% 7.7% 5 0.5% 0 <20 20-34 35-44 45-54 55-64 65-74 75-84 >84 Age SEER 18 2008-2012, All Races, Both Sexes Melanoma of the skin is most frequently diagnosed among people aged 55-64. Median Age At Diagnosis 63
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The graph in the figure below summarizes the age at which people are diagnosed with melanoma, the most serious form of skin cancer. Use the graph to explain why protection from skin cancer may not explain the strong selective pressure for dark skin in high-UV areas. - People with lighter skin are less likely to get melanoma. - Darker skin blocks more UVB rays, which are needed for Vitamin D production. - Deaths from skin cancer occur after the reproductive years. - Deaths from skin cancer occur before the reproductive years.
Madhur L.
Four hundred melanoma patients were diagnosed according to the type of skin cancer and the location of the skin cancer. This data is presented below. What proportion of patients had superficial spreading melanoma? Location Type Head and Neck Trunk Extremities Total Hutchinson's melanomic freckle 22 2 10 34 Indeterminate 11 17 28 56 Nodular 19 33 73 125 Superficial spreading melanoma 16 54 115 185 Total 68 106 226 400
Sri K.
UV light from the sun will literally "zap" your DNA and cause mutations. Let's say you forgot to put on sun screen, and you get a mutation in a gene that controls a skin cell growth gene. What is the possible outcome of this? Susceptibility to acne. Skin cancer. e.g. Basal Cell Carcinoma. Likely no outcome, since mutations rarely cause negative effects. A better suntan.
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