What signifies Prophase II in meiosis?

Prophase II in meiosis is characterized by the reappearance of duplicated chromosomes and the formation of spindle fibers in each of the two new cells created during Meiosis I. This phase occurs after the two cells have completed Meiosis I, which means each cell already has a haploid set of chromosomes, each consisting of two sister chromatids.

During Prophase II, the chromosomes condense, becoming visible again under the microscope, while the nuclear envelope breaks down (if it was reformed in the interkinesis phase). Spindle fibers form from microtubules to prepare the chromosomes for alignment and subsequent separation. This effectively sets the stage for the division of sister chromatids into individual chromosomes in the following phases of meiosis.

Other options pertain to processes occurring either in earlier phases of meiosis or do not accurately represent what happens during Prophase II. For instance, homologous pairing occurs during Prophase I, not Prophase II, and the nuclear membrane formation mentioned relates to the telophase stages or the earlier return of the nuclear envelope after the first meiotic division.