DNA tests show that two plants have different variants of one gene. The plants have the same leaf colour when grown under identical conditions.
Which statement correctly explains the origin of the variants and the observation?
The variants originally arose through fertilisation; different variants need not produce different phenotypes.
The variants originally arose through mutation; different variants must always produce different phenotypes.
The variants originally arose through fertilisation; different variants must always produce different phenotypes.
The variants originally arose through mutation; different variants need not produce different phenotypes.
44 exam-style questions on AQA GCSE Biology 6.2 Variation and evolution, covering 6.2.1 Variation, 6.2.2 Evolution, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, and 6.2.5 Cloning. Each one has a worked solution and a mark scheme showing where the marks go.