A population of a small freshwater animal contains two alleles, W and C, for temperature tolerance.
Scientists measured reproductive success at two water temperatures. The table shows the mean number of offspring per adult that survived to breeding age.
| Water temperature in °C | Allele carried by adult | Mean number of offspring surviving to breeding age per adult |
|---|---|---|
| 18 | W | 2.1 |
| 18 | C | 4.7 |
| 28 | W | 4.3 |
| 28 | C | 0.8 |
Explain how the frequency of allele W would be expected to change over many generations if the water remained at 18 °C and if the water changed to 28 °C.
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.