A-LevelBiologyInherited changeMay/June 2023Paper 4 Q106 Marks
Sweet peas are garden plants that vary in height. • Tall sweet peas grow to 200 cm in height. • Dwarf sweet peas grow to 30 cm in height. • Tall sweet peas contain a dominant Le allele. • Dwarf sweet peas are homozygous for the recessive le allele. Explain how the lele genotype results in the dwarf phenotype in sweet peas, with reference to the effect of lele on: • enzyme synthesis • hormone production • the expression of genes affecting plant growth.
📋 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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