During the S phase (Synthesis), DNA replication occurs, and the amount of DNA per cell doubles from 2C to 4C. During the G2 phase (Gap 2), the cell continues to grow and synthesizes proteins in preparation for mitosis, maintaining the DNA content at the 4C level , . Although the cell enters the M phase (Mitosis) with 4C DNA, this phase concludes with the division of the cell into two daughter cells (cytokinesis), reducing the DNA content back to 2C. Therefore, the phase where the DNA content remains constant at 4C throughout is the G2 phase.