Light skin is most adaptive in northern latitudes because

Question

Quizplus · Accepted Answer

In northern latitudes, there is less UV radiation, which means there is less risk of folate destruction. However, vitamin D synthesis requires UV radiation, which is why lighter skin is advantageous in these regions as it allows for more efficient vitamin D production. Additionally, lighter skin allows for adequate folate for fetal development, which is essential for preventing birth defects. Option A is incorrect because dark skin protects against folate destruction in regions with high UV radiation, but in northern latitudes, the risk is much lower. Option B is incorrect because greater UV radiation is associated with lower latitudes. Option C is incorrect because an increase in melanin is associated with a lower risk of melanoma, not a higher risk.

Light Skin Is Most Adaptive in Northern Latitudes Because