What happens during the G2 phase of the cell cycle?

During the G2 phase of the cell cycle, the cell is primarily preparing for mitosis. This preparation involves a number of critical processes. The G2 phase follows DNA synthesis in the S phase and is the final step before the cell enters mitosis. During this phase, the cell undergoes various checks to ensure that DNA has been properly replicated and that there are no errors or damage. Additionally, the cell increases its overall size and produces the necessary proteins and organelles that will be required for cell division.

This preparation is essential because it sets the foundation for successful mitotic division, allowing one mother cell to split into two daughter cells, each with the correct number of chromosomes. The other choices focus on events that occur at different stages of the cell cycle; for instance, chromosome condensation takes place during the prophase of mitosis, spindle fibers form during prophase and are not disappearing during G2, and the reappearance of the nucleus occurs at the end of mitosis, specifically during telophase.