Researchers studied an inherited pale-leg characteristic in a population of field crickets. They measured the percentage of pale-legged crickets after each generation had reproduced.
| Generation | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Percentage of pale-legged crickets | 18 | 18 | 25 | 33 |
Which conclusion is supported by the data?
Pale legs caused the crickets carrying the characteristic to reproduce more successfully.
Individual crickets developed pale legs after they had reproduced.
The percentage of pale-legged crickets stayed the same at first and then increased.
The total number of pale-legged crickets increased after the second generation.
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.