A grass population has inherited variation in its tolerance of salt. Scientists grew plants from this population at two soil salt concentrations.
The table shows the mean number of seeds produced per plant.
| Salt tolerance of plant | Mean number of seeds per plant at low salt concentration | Mean number of seeds per plant at high salt concentration |
|---|---|---|
| Lower | 96 | 15 |
| Higher | 72 | 81 |
A field containing this grass has a low soil salt concentration for many generations. The field is then flooded, and the soil remains at a high salt concentration.
Explain how the frequency of alleles associated with salt tolerance in the grass population is likely to change before and after the flooding. Use data from the table.
71 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.