DNA replication occurs during the S phase of interphase. Interphase is divided into three main stages: G1 (Gap 1), S (Synthesis), and G2 (Gap 2).
During the S phase, the cell’s genetic material is duplicated in preparation for cell division. This is a crucial step, as it ensures that when the cell eventually divides, each new cell will have a complete set of DNA. The S phase is characterized by the synthesis of new DNA strands, resulting in the formation of sister chromatid pairs. After the S phase, the cell continues to grow and prepare for mitosis during the G2 phase.
Therefore, understanding the S phase is essential for grasping how cells replicate their DNA and maintain genetic integrity throughout the cell cycle.