During which part of interphase does DNA synthesis occur?

DNA synthesis occurs during the S phase of interphase. This is the phase where the cell replicates its DNA in preparation for cell division. During the S phase, each chromosome is duplicated, ensuring that both daughter cells will have an identical set of chromosomes after division. This process is crucial for maintaining genetic continuity and ensuring that the genetic information is correctly passed on during cell division.

The other phases of interphase, such as G1 and G2, involve different activities: G1 is primarily focused on cell growth and preparation for DNA synthesis, while G2 is concerned with further growth and preparation for mitosis. The M phase, or mitosis, is when actual cell division takes place, but it does not involve DNA synthesis. Thus, identifying the S phase as the time for DNA synthesis is essential for understanding cell cycle dynamics.