Scientists recorded the number of beetles with striped wing cases in two generations. The wing-case pattern is inherited.
| Generation | Beetles with striped wing cases | Total beetles sampled |
|---|---|---|
| Earlier | 18 | 60 |
| Later | 54 | 90 |
Calculate the percentage of beetles with striped wing cases in each generation.
Explain how the results provide evidence for evolution in this population.
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.