Answered: 4. Briefly describe the 2 reasons why…

4. Briefly describe the 2 reasons why the Inuit people exhibit somewhat darker skin levels than would be predicted given the UV levels at their latitude.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter32: Deuterostomes: Vertebrates And Their Closest Relatives

Section: Chapter Questions

Problem 13TYK

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Concept explainers

Learning and memory

Learning is defined as a relatively permanent and irreversible adaptive change in behavior. It always results from experience. The ability of an organism to store and recall the effects, sensations, and knowledge gained through learning and experience is called memory.

Question

Please answer number 4

1. How does skin cancer not exert enough evolutionary pressure to account for
darker skin in humans?
2. How does folate deficiency exert enough evolutionary pressure to account for
darker skin in humans?
3. What is one indispensable function of UVB rays in the human body? How does this
exert evolutionary pressure on human skin color?
4. Briefly describe the 2 reasons why the Inuit people exhibit somewhat darker skin
levels than would be predicted given the UV levels at their latitude.
5. What theory do the authors propose for why women generally have lighter skin
than men?
6. Briefly explain why skin color is described as "one of the least useful
characteristics in determining the evolutionary relations between human groups"?
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Please answer number 2
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What factors caused the correlation between the reduction in skin pigmentation in humans and migration of human populations away from the equator? The exposure of human populations to predators only common to the polar regions caused them to adapt by camouflaging better with the environment. The exposure of human populations to less UV light required a reduction in melanin to produce more vitamin D for healthier bones. The exposure of human populations to new sources of food common to the polar regions caused changes in physiology that resulted in the production of less melanin. The exposure of human populations to new diseases common to the polar regions interferred with melanin production causing lighter skin.
1. What is the function of melanin in humans? What is the function of melanin in other species? 2. According to the film, why is there a lack of diversity in the MC1R allele among African populations? 3. According to the film, why was dark skin selected for regions close to the equator? 4. Describe the selective pressure favoring light skin in regions far from the equator. 5. Which human populations living in which environments are most at risk for rickets today and why?
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