Q: When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes?


Read this paragraph and choose the correct option from the provided answers:

During crossing-over, segments of DNA are exchanged between non-sister chromatids of homologous chromosomes. Notice how this can result in an allele (A) on one chromosome being moved to the other chromosome. The four chromatids compose the tetrad, with a chiasma at the point of exchange.

 Choices:

- during meiosis

- during mitosis

- during diversion

- during crossing-over


A:
during crossing-over