A-LevelBiologySelection and evolutionMay/June 2024Paper 4 Q78 Marks
It has been hypothesised that the mutation rate of an animal species may affect how fast animals of that species age and how long they live (lifespan). Table 7.1 compares the mutation rate and lifespan of five species of mammal. Table 7.1 species mutation rate per million base pairs per year mean lifespan /years cattle 0.08 20 ferret 0.20 8 horset0.05 30 human 0.02 75 house mouse 0.28 3.6
📋 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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