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• Wavelengths of light are reflected or absorbed by pigment in the skin called melanin. Melanin is synthesized in structures called melanosomes that are produced by cells called melanocytes. • There are two primary types of melanin in humans: pheomelanin, which is reddish yellow, and eumelanin, which is brown black.
Based on this new information, revise your hypothesis to explain the selective pressure on the evolution of human skin color. The greater amount of eumelanin in darker skin protects folate from being broken down by UV radiation and thus increases fitness among populations in high-intensity UV areas. 17.
To determine whether the variation in human skin color is the result of evolution by natural selection, scientists look for patterns revealing an association between different versions of the trait and the environment. Then they look for selective pressures that can explain the association.
21 wrz 2015 · This activity explores the evidence that differences in human skin color are adaptations to varying intensity of UV light, as discussed in the short film The Biology of Skin Color.
Study with Quizlet and memorize flashcards containing terms like MC1R allele, __________ selection for light skin color in equatorial Africa, Reduced folate (water soluble B vitamin) levels lead to.......... and more.
The manner in which visible light interacts with an object is dependent upon the frequency of the light and the nature of the atoms of the object. In this section of Lesson 2 we will discuss how and why light of certain frequencies can be selectively absorbed, reflected or transmitted.
6 gru 2023 · Explain how objects in our surroundings produce different colors through selective reflection or absorption of parts of the visible spectrum.
