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How is the distribution of the amount of UV light reaching the earth and variation in skin pigment related?

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26-05-2020
Biology

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WILL GIVE BRAINLIEST and 20 POINTS!!!
How is the distribution of the amount of UV light reaching the earth and variation in skin pigment related?

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onetriptj onetriptj · Answer 1 · 2020-05-26T18:37:38+02:00

Answer:Human skin pigmentation is the product of two clines produced by natural selection to adjust levels of constitutive pigmentation to levels of UV radiation (UVR). One cline was generated by high UVR near the equator and led to the evolution of dark, photoprotective, eumelanin-rich pigmentation. The other was produced by the requirement for UVB photons to sustain cutaneous photosynthesis of vitamin D3 in low-UVB environments, and resulted in the evolution of depigmented skin. As hominins dispersed outside of the tropics, they experienced different intensities and seasonal mixtures of UVA and UVB. Extreme UVA throughout the year and two equinoctial peaks of UVB prevail within the tropics.

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WILL GIVE BRAINLIEST and 20 POINTS!!! How is the distribution of the amount of UV light reaching the earth and variation in skin pigment related?

Respuesta :

Otras preguntas

WILL GIVE BRAINLIEST and 20 POINTS!!!
How is the distribution of the amount of UV light reaching the earth and variation in skin pigment related?