CAIE A Level Biology 9700 · The mitotic cell cycle
A patient's skin stem cells have very short telomeres compared to healthy individuals. Explain how the structure and replication of chromosomes would be affected in these cells, and why this leads to a reduced ability to repair skin wounds. In your answer, describe the role of the cell cycle in producing genetically identical cells.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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