What happens during the G1 Phase of the cell cycle?

During the G1 Phase of the cell cycle, the primary activity involves cellular growth and the synthesis of various organelles. This phase is critical because it prepares the cell for DNA synthesis in the subsequent S phase. During G1, the cell increases in size, produces RNA and proteins, and duplicates its organelles, which are essential for the cell's functions and for supporting the increased metabolic activity that will occur during the later stages of the cell cycle.

The focus on growth and organelle production sets the stage for the cell to enter the next phase, where DNA replication occurs. Consequently, a healthy and adequately prepared G1 phase is vital for ensuring that cells can divide correctly and efficiently later on in the cell cycle.