Final answer:
During the G₂ phase, a cell grows, checks chromosome integrity, synthesizes proteins for mitosis, duplicates organelles, and dismantles the cytoskeleton to provide for the mitotic spindle.
Step-by-step explanation:
During the G₂ phase of the cell cycle, the cell goes through several crucial processes before it can enter mitosis. This phase is characterized by rapid cell growth, replenishing energy stores, and synthesizing necessary proteins for chromosome manipulation. Some of the cell's organelles are duplicated, and the cytoskeleton is dismantled to provide resources for the mitotic spindle. Additionally, chromosome integrity is checked for errors and repaired as needed to ensure proper cell division. As part of the final preparations, tubulins and other proteins necessary for mitosis are produced.