Question

Identify two physiological effects of solar radiation that likely acted as selective pressures in shaping the pattern of clinal variation of human skin color.

Answer 1

Latitude

• high latitude
• low latitude

Step-by-step explanation:

Clinical variations takes about gradual change in a trait and this variations take place over the geographic space, In clinical variations in skin color the latitude plays a major role because the latitude determine the amount of UV rays one will be exposed to.

The two physiological effects of solar radiation are At

• High latitude: An individual is less exposed to UV rays hence the person tends to have a lighter skin while having a higher probability of Vitamin D synthesis
• low latitudes : An individual is more exposed to UV rays hence the person tends to have a darker skin and increased protection against folate deficiencies.