Which of the Following Statements Is True

Multiple Choice

Which of the following statements is true?

A) Sister chromatid exchange would mutate one strand of DNA.
B) Harlequin chromosomes are a result of homologous recombination.
C) Sister chromatid exchange would lead to a reshuffling of alleles.
D) Crossing over has a cytological basis.
E) Exchanges occur between homologous chromosomes,but never between sister chromatids.