biointeractive understanding variation in human skin color

Variations in human skin color are adaptive traits that correlate closely with geography and the sun’s ultraviolet (UV) radiation. In both cases, understanding the genetic architecture of human skin color is likely to provide a greater appreciation of underlying biological mechanisms, much in the same way that mutational hotspots in the gene TP53 have helped to educate society about the risks of tobacco (Takahashi et al. Variations in human skin color can be quantified, or measured. Based on what you know about skin pigmentation so far, suggest a mechanism by which UV intensity could provide a selective pressure on the evolution of human skin color. Our records indicate you have visited a previous version of this interactive video on this device before. As early humans moved into hot, open environments in search of food and water, one big challenge was keeping cool. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Understanding Variation in Human Skin Color INTRODUCTION Activity Student Handout A look around the world shows that people’s skin comes in many different shades from the lightest pink to darkest brown. 10. All of this variation can’t be explained by differences in a single gene. Start studying HHMI: The Biology of Skin Color Video. Theory held that darker skin had evolved in order to afford early humans—who had recently lost the cover of fur—a protection against skin cancer under the tropical sun. Based on the mathematical expression, predict how many distinct phenotypes would result from six genes, each with two alleles, according to … • In the last part of the handout, students answer questions about the evolution of human skin color. On average, the skin color of indigenous peoples around the world correlates with the UV intensity in their environments. Describe the relationship between folate levels and UV exposure. The Sepia Rainbow . Skin comes in such an array of colors because it is a polygenic trait. Human Evolution Revised April 2018 www.BioInteractive.org Page 3 of 4 . www.BioInteractive.org Page 7 of 10 The Biology of Skin Color Lesson Student Handout QUESTIONS PART 2: Interpreting the Figure 14. In the early 1990s, the evolution of skin color was regarded by many of her peers as an intractable problem. 1989; Toyooka et al. Activity Educator Materials. Both human skin color and mouse fur color are determined in part by variations in the MC1R Human skin color ranges from the darkest brown to the lightest hues. 2003). Understanding Variation in Human Skin Color The Biology of Skin Color Revised November 2017 www.BioInteractive.org Page 3 of 7 Activity Student Handout 3. Human skin color variation is mostly determined by the types and amounts of melanin present in the skin. Human Skin Color: Evidence for Selection. 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.”

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