A Levels Biology (9700)•9700/13/M/J/24
Explanation
Mitosis outcomes in daughter vs. parent cell
Steps:
- In mitosis, chromosomes duplicate then divide equally, so daughter has same number as parent.
- Cytoplasm partitions between two daughters, halving volume per cell.
- DNA replication shortens telomeres by 50-200 base pairs per cycle.
- Compare traits: chromosomes unchanged, cytoplasm reduced, telomeres eroded.
Why D is correct:
- Mitosis conserves chromosome number (diploid to diploid), halves cytoplasm via cytokinesis, and shortens telomeres per the end-replication problem in linear chromosomes.
Why the others are wrong:
- A: Chromosomes remain the same, do not increase.
- B: Chromosomes remain the same, do not increase.
- C: Cytoplasm halves and telomeres shorten, neither remains the same.
Final answer: D
Topic: Replication and division of nuclei and cells
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