hhi Biointeractive
Human Skin Color: Evidence for Selection
PART 2: What Was the Selective Pressure?
Activ
Student Hand
Watch the film from time stamp 9:08 minutes to 12:19 minutes. Pause when Dr. Jablonski says, "For that reas
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 11-13.
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 th
evolution of darker skin in our human ancestors?

Question

18-05-2024
Biology

Answered

hhi Biointeractive
Human Skin Color: Evidence for Selection
PART 2: What Was the Selective Pressure?
Activ
Student Hand
Watch the film from time stamp 9:08 minutes to 12:19 minutes. Pause when Dr. Jablonski says, "For that reas
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 11-13.
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 th
evolution of darker skin in our human ancestors?

Answer :

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GinnyAnswer GinnyAnswer · Answer 1 · 2024-05-18T20:51:52-04:00

Final answer:

The response explains negative selection in equatorial Africa in relation to MC1R allele diversity and why the protective benefits of darker skin outweigh the risk of skin cancer, as highlighted by Dr. Jablonski.

Explanation:

Negative selection refers to the process where a trait, like light skin coloration in equatorial Africa, is disadvantageous and decreases in frequency due to natural selection. In African populations, the MC1R allele diversity may be lower in regions with high UV radiation, indicating a correlation between sunlight intensity and skin color adaptation.

Dr. Jablonski dismisses the hypothesis of protection from skin cancer driving the evolution of darker skin in our ancestors because the benefits of darker skin in protecting against UV radiation and folate depletion outweigh the risk of skin cancer, making it a more plausible selective pressure for skin color evolution.

Learn more about Human Skin Color Evolution here:

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