Final answer:
During the S phase of the cell cycle, DNA synthesis takes place to ensure that each daughter cell receives a complete set of genetic material.
Step-by-step explanation:
In the cell cycle, DNA synthesis occurs during the S phase, which stands for synthesis phase.
During this phase, the cell replicates its DNA, ensuring that each daughter cell receives a complete set of genetic material.
This process is essential for cell division and occurs before the cell enters the M phase, where mitosis and cytokinesis take place.