A breeder wants plants that produce more fruit and resist disease. Offspring from a cross are tested in two groups. Group P receives extra fertiliser and no exposure to the pathogen. Group Q receives standard fertiliser and exposure to the pathogen. The breeder selects the highest-yielding P plants and the least-damaged Q plants as parents.
Which revised method would best identify plants with both desired inherited characteristics?
Compare P and Q directly, select their highest yields, and clone only those selected plants.
Grow offspring under matched conditions without the pathogen, select both traits, and repeat breeding.
Grow offspring under matched conditions with the pathogen, select both traits, and repeat breeding.
Compare P and Q directly, select their lowest damage, and clone only those selected plants.
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.