During the cell cycle associated with mitosis, in which phase is DNA replicated?

• A. Telophase
• B. S phase of interphase
• C. Metaphase
• D. Prophase

Answer: (B)

Verified step by step guidance

1. Understand the phases of the cell cycle: The cell cycle consists of interphase (G1, S, G2 phases) and the mitotic phase (mitosis and cytokinesis).
2. Recall that DNA replication occurs before mitosis to ensure each daughter cell receives an identical set of chromosomes.
3. Identify that DNA replication specifically happens during the S phase (Synthesis phase) of interphase, where the cell synthesizes a complete copy of its DNA.
4. Recognize that the mitotic phases (prophase, metaphase, anaphase, telophase) involve chromosome condensation, alignment, separation, and cell division, but not DNA replication.
5. Conclude that the correct phase for DNA replication is the S phase of interphase, not any of the mitotic phases like prophase, metaphase, or telophase.