gene shuffling directional selection natural selection genetic drift
I gave my students this multiple choice question: Individuals that carry a particular allele may have more descendants than other individuals, resulting in the allele becoming more common. Which process causes random alleles to become more common within a population?

Only one answer is correct among these 4 choices:
- gene shuffling
- directional selection
- natural selection
- genetic drift

Could you tell me which one is correct?

genetic drift