A Levels Biology (9700)•9700/11/O/N/21

Explanation
Mitosis Phases in Cell Cycle Graph
Steps:
- Identify interphase as G1, S, G2 stages before mitosis, with no chromosome condensation.
- Recognize metaphase as stage where chromosomes align at metaphase plate, often shown as stable in graphs.
- Note anaphase as separation of chromatids, depicted by decreasing chromosome count or movement.
- Match T to V as alignment phase (metaphase) and W to X as separation (anaphase), excluding interphase.
Why B is correct:
- Statement 2 aligns T to V with metaphase definition of chromosome alignment; statement 3 matches W to X with anaphase law of chromatid separation toward poles.
Why the others are wrong:
- A includes 1, but T to V shows condensed chromosomes, not interphase replication.
- C selects only 1, ignoring metaphase and anaphase matches.
- D selects only 2, omitting correct anaphase identification.
Final answer: B
Topic: Chromosome behaviour in mitosis
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