Question

question 10 of 10
when is genetic drift a major factor in evolution?
a. when there is directional selection
b. when there is high selective pressure
c. when there is a bottleneck
d. when there is male choice

Explanation:

Genetic drift is a major factor in evolution when there is a bottleneck. A bottleneck occurs when a population is drastically reduced in size (e.g., due to natural disasters, over - hunting). In such small populations, random changes in allele frequencies (genetic drift) have a more significant impact. Directional selection (A) is a type of natural selection, not related to genetic drift. High selective pressure (B) is associated with natural selection favoring certain traits. Male choice (D) is a form of sexual selection, not a situation where genetic drift is a major factor.

Answer:

C. When there is a bottleneck