I'm having trouble answering some of these questions. Many theories have been proposed for the evolution of dark skin pigmentation – and a new paper revives one of the oldest: that skin cancer was a more potent selective … Nina Jablonski proposed a hypothesis to explain the selective pressure for darker skin in these environments. The graph in Figure 2 summarizes the age at which people are diagnosed with melanoma, the most serious form of skin cancer. Why does protection from skin cancer not explain the strong selective pressure for dark skin in high UV ares. Clark M (2010) Skin assessment in dark pigmented skin: a challenge in pressure ulcer prevention.Nursing Times; 106: 30, early online publication. Ancestral populations near the equator were selected for dark skin, while those living in higher northern latitudes were selected for lighter skin. Q. As human ancestors began to migrate to various places around the world, the pressure for selection of dark skin color was not as intense. On what evidence did she base this hypothesis? Pigmentation, (skin color), in humans has evolved under selection pressure from the duration and intensity of sunlight. In dark skinned populations the MC1R locus is extremely conserved, suggesting powerful selective constraints which prevent sequence variation. Q. Darker skin is more prevalent in high-UV areas. Overall, human skin color is a highly variable and complex trait as a consequence of strong selection pressure and is controlled by multiple genetic loci (summarized in Table 1). Dr. Nina Jablonski proposed a hypothesis to explain the selective pressure for darker skin in these environments. One of them asked, "how strong a selective pressure do you expect skin cancer (UV-induced mutations) to exert on reproductive success?" On what evidence did she base this hypothesis? Human skin color ranges from the darkest brown to the lightest hues. Skin assessment is a vital element in the prevention of pressure ulcers, and many recommendations for skin assessment depend on visual and tactile cues to identify changes in skin appearance. Abstract. In this model the dark skin of humans naturally arose because women who were darker skinned carried more normal fetuses to term than those who were light skinned. The graph in Figure 2 summarizes the age at which people are diagnosed with melanoma, the most serious form of skin cancer. Why does protection from skin cancer not explain the strong selective pressure for dark skin in high UV ares. I said, "Skin cancer does exert a very strong selective pressure on reproductive success. While evidence is still being collected, most scientists agree that the natural selection for the lighter eye colors is linked to the relaxation of selection for the darker skin tones. 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