Interphase precedes mitosis and includes G1, S, and G2 phases

Steps:

• Recall that the cell cycle consists of interphase (preparation) and mitosis (division).
• Interphase subphases are G1 (growth), S (DNA synthesis), and G2 (further growth and preparation).
• In standard diagrams, stages 1 and 2 represent G1 and S, occurring before mitotic stages.
• Stages 3 and 4 typically depict mitosis and cytokinesis, post-interphase.

Why A is correct:

• Stages 1 and 2 align with G1 and S phases, defined as part of interphase for cell growth and DNA replication before mitosis.

Why the others are wrong:

• B: Stage 3 is mitosis (prophase or later), not interphase.
• C: Stage 4 is cytokinesis, the final division step after mitosis.
• D: Both 3 and 4 occur during mitosis and cytokinesis, outside interphase.

Final answer: A