pairing of chromosomes creation of haploid gametes segregation of alleles separation of chromatids
I gave my students this multiple choice question: Which of the following events during meiosis contributes most to the variation within a species?

Only one answer is correct among these 4 choices:
- pairing of chromosomes
- creation of haploid gametes
- segregation of alleles
- separation of chromatids

Could you tell me which one is correct?

segregation of alleles