Watch the film from time stamp 5:49 minutes to 9:08 minutes. Pause when Dr. Jablonski says, “That suggests that variation in human skin melanin production arose as different populations adapted biologically to different solar conditions around the world.” III. After watching this segment of the film, answer Question 10. 10. 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. In other words, propose a hypothesis that links skin color to evolutionary fitness.
Watch the film from time stamp 5:49 minutes to 9:08 minutes. Pause when Dr. Jablonski says, “That suggests that variation in human skin melanin production arose as different populations adapted biologically to different solar conditions around the world.”
IV: What Was the Selective Pressure?
Watch the film from time stamp 9:08 minutes to 12:19 minutes. Pause when Dr. Jablonski says, “For that reason, though it might cut your life short, it’s unlikely to affect your ability to pass on your genes.”
After watching this segment of the film, answer Questions 11–12.
11. What does it mean for a trait, such as light skin coloration, to be under negative selection in equatorial Africa? Relate negative selective pressure to what we know about MC1R allele diversity among African populations.
12. Why does Dr. Jablonski dismiss the hypothesis that protection from skin cancer provided selection for the evolution of darker skin in our human ancestors?
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10. 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. In other words, propose a hypothesis that links skin color to evolutionary fitness.
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