How does the nucleus contribute to cell division?

The nucleus contributes to cell division in several different processes. During prophase, the chromatin in the nucleus undergoes condensation, and is formed into chromosomes. This condensation allows for efficient chromosome segregation. The nuclear envelope also breaks down, allowing spindle fibers to interact with the chromosomes. This dissipation assists in the movement of chromosomes during cell division. The DNA in the nucleus is then replicated during the S phase of the cell cycle. Without the nucleus, there would be no mechanism for each daughter cell to receive an identical copy of the genetic material. In telophase, the nuclear envelope reforms around the separate chromosomes enclosing them within newly formed nuclei in each cell.