What phase occurs in nuclear division when the nuclear membrane reforms?

During telophase, the last stage of nuclear division, the nuclear membrane reforms around each set of separated chromosomes. This process marks the transition from the segregated chromatids back into a state where they can function as individual nuclei within daughter cells. As the chromosomes begin to de-condense, the newly formed nuclei start to regain their typical structure, which includes the re-establishment of the nuclear envelope.

In contrast, during prophase, the nuclear envelope breaks down and the chromatin condenses into visible chromosomes. In anaphase, the chromosomes are pulled apart towards opposite poles of the cell, but there is still no nuclear membrane present around them. Cytokinesis, while related to cell division, is the physical process of the cell dividing and is distinct from the reformation of the nuclear membrane. Thus, telophase plays a crucial role in the restoration of the nucleus after the genetic material has been successfully segregated.