selective pressure darker skin color quizlet

What is the selective pressure for darker skin color Quizlet

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What is selective pressure for darker skin color?

Toward the poles, selective pressure for dark skin (to protect folate) decreases and selection for lighter skin shades (to enable vitamin D synthesis) increases. Selection for light-skin gene variants occurred multiple times in different groups around the world. Today, human migration does not take generations.

Which of the following statements is true about human skin color quizlet?

1. Which of the following statements is true about human skin color? It ranges from pure white to pure black. It is primarily due to the presence of a pigment called melanin which is found in all normal humans.

How did skin color evolve quizlet?

Darker skin colors evolved because they provided increased fitness in early human populations living in equatorial Africa. Darker skin protects circulating folate from being broken down. Some human populations migrated out of Africa to places where UV radiation was less intense.

What are the 2 primary types of melanin and how do they differ?

There are two types of melanin. Eumelanin is black or brown pigment and pheomelanin is red or yellow pigment. People who make lots of pheomelanin tend to have lighter skin, often because of freckling. Freckles happen when melanocytes clump together.

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