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Explain how the $lele$ genotype produces the dwarf phenotype in sweet peas, referring to the effect of $lele$ on: • enzyme synthesis • hormone production • the expression of genes affecting plant growth.
Biology 9700 · AS & A Level · Gene control
Gene control — practice question
Sweet peas are garden plants whose height differs.
• Tall sweet peas reach 200 cm in height.
• Dwarf sweet peas reach 30 cm in height.
• Tall sweet peas have a dominant $Le$ allele.
• Dwarf sweet peas are homozygous for the recessive $le$ allele.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The $le$ allele codes for a non- or less-functional enzyme” …
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