What happens during Anaphase II of meiosis II?

During Anaphase II of meiosis II, sister chromatids are pulled apart to opposite poles of the cell. This phase is critical because it ensures that each resulting gamete will contain a single copy of each chromosome. Anaphase II follows Metaphase II, where chromosomes are aligned at the metaphase plate, and the separation of sister chromatids ensures that the genetic material is evenly distributed.

The other stages referenced in the options involve different processes. Chromosome condensation occurs much earlier in meiosis during prophase; it is when chromatin fibers condense into distinct chromosomes. The reformation of the nucleus happens later in telophase, not during Anaphase II. Lastly, the alignment of bivalents along the metaphase plate is a characteristic of Metaphase I, not Anaphase II, which deals with separated sister chromatids.