Genetic drift Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which statement about genetic drift is correct?
- A. It favours alleles that give an advantage
- B. It is a random change in allele frequency
- C. It is most important in very large populations
- D. It creates new alleles
2. Why does genetic drift have little effect in a large population?
- A. Large populations have no chance events
- B. Large populations have more mutations
- C. Chance events affect only a small fraction of the gene pool
- D. Natural selection cannot act on them
3. Which could result from genetic drift in a small population?
- A. Loss of an allele that gave no advantage or disadvantage
- B. A beneficial allele always increasing in frequency
- C. No change in allele frequency over time
- D. An increase in genetic variation
4. A population falls from 5000 to 8 individuals. Which statement is most likely to be correct?
- A. Its allele frequencies are identical to before
- B. Its genetic variation has probably decreased
- C. Natural selection can no longer act
- D. Mutation has stopped
5. Which pair are the two forces affecting genetic variation in populations?
- A. Mutation and meiosis
- B. Migration and fertilisation
- C. Genetic drift and natural selection
- D. Selection and competition