A-LevelBiologyThe mitotic cell cycleOct/Nov 2019Paper 4 Q214 Marks
2 (a) The house mouse, Mus musculus, has a diploid number of 40 chromosomes. Fig. 2.1 shows 6 of these chromosomes. [Figure 2.1] (b) Fig. 2.2 shows the banding pattern of chromosome pair 11 of M. musculus. The banding pattern is obtained by staining. [Figure 2.2]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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