A population of coastal plants has inherited variation in salt tolerance. Seawater repeatedly floods the area where the plants grow. Scientists recorded the number of plants present before one flood and the number of these plants that later produced seeds.
| Salt tolerance | Number of plants before the flood | Number of plants that produced seeds |
|---|---|---|
| low | 240 | 36 |
| high | 160 | 80 |
Use the data to explain how the salt tolerance of this population is likely to change over many generations of repeated seawater flooding. Include calculations in your answer.
85 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.