객관식
In the 1820s, what did scientists commonly believe dinosaurs actually were?
161
views
1. Introduction to Biology
Natural Selection and Evolution
객관식
Which of the following best describes the main selective pressure that favored the evolution of darker skin color in human populations?
A
Increased absorption of vitamin D in low sunlight environments
B
Protection against ultraviolet (UV) radiation damage
C
Enhanced resistance to cold temperatures
D
Improved camouflage in forested environments
검증된 단계별 안내1
Understand the concept of selective pressure: Selective pressure refers to environmental factors that influence the survival and reproduction of organisms, favoring certain traits over others in a population.
Recognize the role of UV radiation: Ultraviolet (UV) radiation from the sun can damage DNA and deplete folate, a vital nutrient for cell division and reproduction. This damage can negatively impact reproductive success.
Connect darker skin pigmentation to UV protection: Darker skin contains more melanin, a pigment that absorbs and dissipates UV radiation, reducing the risk of DNA damage and folate depletion.
Eliminate incorrect options: Increased absorption of vitamin D is associated with lighter skin in low sunlight environments, not darker skin. Resistance to cold temperatures and camouflage in forested environments are unrelated to skin pigmentation.
Conclude the main selective pressure: The evolution of darker skin color in human populations was primarily driven by the need for protection against UV radiation damage in regions with high UV exposure.
