The table compares the same length of DNA from three organisms.
Table
| Pair | Number of different bases |
|---|---|
| P and Q | 6 |
| P and R | 21 |
| Q and R | 19 |
Which statement is supported by the results?
P is closest to Q; R is closer to Q than to P
P is closest to Q; R is closer to P than to Q
P is closest to R; R is closer to P than to Q
P is closest to R; R is closer to Q than to P
40 exam-style questions on Edexcel GCSE Biology 4.2 Evidence for evolution and classification, covering 4.2.1 Fossil evidence for human evolution, 4.2.2 Stone tool evidence for human evolution, 4.2.3 Pentadactyl limb as evidence, and 4.2.4 Three domains classification. Each one has a worked solution and a mark scheme showing where the marks go.