CAIE A Level Biology 9700 · The mitotic cell cycle
A student examines a stained squash preparation of an onion root tip using a light microscope. One cell shows chromosomes lined up at the equator (metaphase plate) of the cell. The nuclear envelope is absent, and spindle fibres are visible.
Describe the events of mitosis occurring in this cell.
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.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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