Some plants in a population of an annual plant species have hairy leaves and others have smooth leaves. Leaf hairiness is inherited.
Scientists recorded leaf hairiness in representative samples from three generations.
| Generation | Total number of plants sampled | Number with hairy leaves |
|---|---|---|
| 1 | 240 | 36 |
| 8 | 220 | 132 |
| 9 | 440 | 264 |
Calculate the difference, in percentage points, between the percentage of plants with hairy leaves in generation 1 and generation 8.
Use the data to explain how the change between generations 1 and 8 provides evidence of evolution.
The number of plants with hairy leaves doubled between generations 8 and 9. Explain whether this shows that further evolution occurred between these generations.
122 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.