<prompt> DNA synthesis occurs during which phase of cell cycleG 1phaseM phaseS phaseG2 phase  <response>: The replication of the DNA genome occurs only at a specified time during the lifespan of the cell. This period is referred to as the synthetic or S phase. This is usually temporally separated from the mitotic, or M phase, by nonsynthetic periods referred to as gap 1 G1 and gap 2 G2 phases, occurring before and after the S phase, respectively Harper30e pg: 383 