During prophase II of meiosis II, which of the following events occurs?

• A. Sister chromatids separate at the centromere and move to opposite poles of the cell.
• B. Chromosomes (each still consisting of two sister chromatids) re-condense, the nuclear envelope breaks down, and a new spindle apparatus begins to form in each haploid cell.
• C. Homologous chromosomes pair (synapsis) and exchange segments through crossing over.
• D. Homologous chromosome pairs (tetrads) align at the metaphase plate before being separated.

Answer: (B)