Researchers use DNA evidence to investigate the evolutionary relationships of orchid species K, L, M and N. They compare DNA from species K with DNA from each of the other species.
A smaller percentage of different bases indicates a closer evolutionary relationship.
| Comparison | Total bases compared | Bases that differ |
|---|---|---|
| K with L | 500 | 10 |
| K with M | 2400 | 24 |
| K with N | 1000 | 15 |
Which statement gives both a valid conclusion from these results and a limitation of these results?
L is most closely related to K; the results do not show which two of L, M and N are most closely related to each other.
L is most closely related to K; percentages cannot be compared because different numbers of bases were examined.
M is most closely related to K; the results do not show which two of L, M and N are most closely related to each other.
M is most closely related to K; percentages cannot be compared because different numbers of bases were examined.
81 exam-style questions on AQA GCSE Biology 6.4 Classification of living organisms, covering 6.4 Classification of living organisms. Each one has a worked solution and a mark scheme showing where the marks go.