If you could examine closely a recombination nodule, you may find

Question

Quizplus · Accepted Answer

Recombination nodules are sites on chromosomes where crossing over occurs during meiosis. Enzymes that break and rejoin homologous chromosomes (such as topoisomerase II and DNA ligase) are found at these sites and are necessary for successful recombination to occur.

Answer: B
 Recombination nodules are formed by the synaptonemal complex during meiosis and are the sites where crossing over occurs between homologous chromosomes. Crossing over involves the exchange of genetic material between non-sister chromatids.

Answer: C and D are incorrect choices.
 Sites of DNA replication are located elsewhere on chromosomes and are not associated with recombination nodules. Cyclin B is a protein involved in the regulation of the cell cycle and is not specifically related to recombination nodules.

If You Could Examine Closely a Recombination Nodule, You May