B. brownish black pigment, higher percentage results in brown or black skin. B. an area at a high altitude near the equator. If you are returning to continue the interactive video, select “Resume.” If this is your first time using the interactive video, or want to start a completely new session in the updated version, select “Start Over.” In an environment without predators, having these variations is a disadvantage because it leads to a shorter lifespan. Biologists once believed that selection for dark skin occurred because it protected against skin cancer. Running time: 10:31 min. Select another correct answer. Press “Confirm” to delete the saved progress and start a completely new session. Select another correct answer. This example describes an evolutionary trade-off because it includes both an advantage and a disadvantage. So, people with lighter skin are more likely to get enough UV to synthesize vitamin D in a wide range of environments. Try again. Rickets is caused by vitamin D deficiency in children, often due to insufficient UV. D. an area at a longitude in the Western Hemisphere. So, in general, people with darker skin living in areas with low amounts of UV have a higher risk of vitamin D deficiency. Individuals with darker skin have more of the brown-black pigment eumelanin in their skin cells. Biology Skin Quizlet. The tomato’s pigments must also absorb blue and green light, or else we would see the tomato as blue or green. Some garter snakes have mutations that make them resistant to a toxin found in their prey, rough-skinned newts. You selected all the correct answers. Also, rickets affects children, not adults. Select another correct answer. So, individuals with larger amounts of eumelanin are favored in high-UV environments. You selected all the correct answers. C. Alleles that caused the loss of body hair allowed humans to lose heat more easily in hot environments. Try again. Open modal to review and print your answers in the Quiz Results. The pigments reflect red light and absorb blue and green light. D. The tomato fruit has the same types and amounts of pigments as in the plant’s leaves, stem, and roots. Try again. Start studying Biointeractive. You selected all the correct answers. B. In HHMI's newest video, Dr. Nina Jablonski, a Penn State biological anthropologist and author of Living Color: The Biological and Social Meaning of Skin Color, takes viewers along on her quest to solve the mystery of skin color.The journey begins with an explanation of melanin, which comes in two forms: reddish-yellow (i.e., pheomelanin) and black and brown (i.e., eumelanin). Data support a correlation between UV intensity and skin color variation. Our records indicate you have visited a previous version of this interactive video on this device before. Helen Snodgrass describes how she uses BioInteractive's The Biology of Skin Color film and "Evidence for Selection" activity to show students how humans have evolved over time. This film explores the hypothesis that different tones of skin color in humans arose as adaptations to the intensity of ultraviolet radiation in different parts of the world. Correct! Where UV intensity is lower, the skin color of indigenous peoples tends to be lighter on average. HHMI BioInteractive Facebook In fact, it is unlikely that people with more darkly pigmented skin would have less folate in their blood, since darkly pigmented skin protects folate from being broken down by sunlight. B. So, it is unclear whether this area would have a high or low amount of UV radiation. What disease may occur in people who have low levels of vitamin D? So, the average skin color overall will not always “match” the UV intensity in an environment.)
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