A Levels Biology (9700)•9700/12/M/J/19
Explanation
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
Topic: Replication and division of nuclei and cells
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