pairing of chromosomes creation of haploid gametes segregation of alleles separation of chromatids
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following events during meiosis contributes most to the variation within a species?
Possibilities:
- pairing of chromosomes
- creation of haploid gametes
- segregation of alleles
- separation of chromatids

segregation of alleles