During which phase of the eukaryotic cell cycle is DNA replicated, resulting in duplication of each chromosome?

• A. M phase (mitosis)
• B. G2 phase of interphase
• C. S phase of interphase
• D. G1 phase of interphase

Answer: (C)

Verified step by step guidance

1. Understand the phases of the eukaryotic cell cycle: G1 phase, S phase, G2 phase (all part of interphase), and M phase (mitosis).
2. Recall that during the G1 phase, the cell grows and performs normal functions but does not replicate DNA.
3. Recognize that the S phase (Synthesis phase) is when DNA replication occurs, resulting in duplication of each chromosome.
4. Note that the G2 phase is a period of preparation for mitosis, where the cell checks for DNA damage and prepares necessary proteins.
5. Understand that the M phase is when mitosis and cytokinesis occur, leading to cell division, not DNA replication.