Mendel crossed pure-breeding purple-flowered plants with pure-breeding white-flowered plants. All their offspring had purple flowers. When these offspring were crossed, white flowers reappeared.
Which explanation best supports Mendel's idea of inherited units?
The white unit was destroyed in the first offspring and recreated in the next generation.
The two units blended in the first offspring and separated again in the next generation.
The white unit remained in the first offspring without determining their visible flower colour.
The purple unit changed in the first offspring and became white in the next generation.
40 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.