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.
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