Mosquitoes of one species live above ground in London. Scientists think that, over 100 years ago, some of these mosquitoes moved into the tunnels of the London Underground.
Scientists tried to breed mosquitoes from the two populations.
The Table shows the results.
Table
| Mosquitoes bred together | Fertile offspring produced |
|---|---|
| above-ground with above-ground | yes |
| underground with underground | yes |
| above-ground with underground | no |
Explain what the results in the Table show about the two populations.
Explain how the underground mosquitoes could have evolved into a new species.
Suggest how scientists could use DNA to support their conclusion about the two populations.
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.