CAIE A Level Biology 9700 · The mitotic cell cycle
A student examines a diagram of a eukaryotic chromosome during prophase of mitosis. The chromosome consists of two sister chromatids joined at a centromere. Describe the detailed structure of this chromosome, including the composition of the chromatids, the location and role of the centromere, and the significance of the ends of the chromatids.
5 marks, so the mark scheme is looking for about 5 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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.