A Levels Biology (9700)•9700/11/M/J/22
Explanation
Identifying correct statements on mitosis stages
Steps:
- Recall mitosis sequence: prophase (spindle forms, chromosomes condense), metaphase (alignment), anaphase (separation), telophase (reformation), cytokinesis (division).
- Evaluate statement 1: Anaphase features separated chromosomes; if P shows reforming nuclei, it's telophase, so incorrect.
- Evaluate statements 3 and 4: DNA remains 4C from G2 through mitosis until cytokinesis; order S (prophase) → R (metaphase) → T (anaphase) → P (telophase) → Q (cytokinesis) matches progression.
- Evaluate statement 2: Spindle forms in prophase/prometaphase; if Q is cytokinesis (no spindle) and T is anaphase (spindle present but not forming), comparison fails, so incorrect.
Why C is correct: Statements 3 and 4 align with mitosis DNA constancy (4C diploid) and standard stage order.
Why the others are wrong:
- A: Includes incorrect 1 and 2.
- B: Includes incorrect 1.
- D: Includes incorrect 2.
Final answer: C
Topic: Chromosome behaviour in mitosis
Practice more A Levels Biology (9700) questions on mMCQ.me