CAIE A Level Biology 9700 · The mitotic cell cycle
Table 1 shows the number of cells observed in each stage of mitosis in a sample from an onion root tip. The total cell cycle time is 24 hours.
| Stage | Number of cells |
|---|---|
| Interphase | 400 |
| Prophase | 100 |
| Metaphase | 30 |
| Anaphase | 20 |
| Telophase | 50 |
Outline the behaviour of chromosomes during anaphase of mitosis. Use the data to support your answer.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.
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