CAIE A Level Biology 9700 · Inheritance
A student examines a photomicrograph of a cell from an insect testis. The cell is in anaphase. The chromosomes appear as V-shaped structures moving towards opposite poles, with some chromosomes clearly consisting of two chromatids joined at a centromere, while others appear as single rods. Outline how the student could use the appearance of the chromosomes to determine whether the cell is in anaphase I or anaphase II of meiosis.
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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