A survey records eight marine invertebrate species. Scientists originally classified the species using their external structures. DNA analysis led to revised classifications.
No species was combined with another species or divided into new species.
| Species | Original binomial name | Revised binomial name |
|---|---|---|
| P | Calidia alba | Calidia alba |
| Q | Calidia minor | Neridia minor |
| R | Calidia robusta | Calidia robusta |
| S | Neridia longa | Neridia longa |
| T | Neridia brevis | Neridia brevis |
| U | Oceana rubra | Pelagia rubra |
| V | Oceana pallida | Oceana pallida |
| W | Pelagia magna | Pelagia magna |
Calculate the number of different pairs of species that share a genus before and after the DNA analysis, and the number of genera represented before and after the DNA analysis.
Show your working.
Use your results in part (a) to explain whether those totals establish that genus membership is unchanged. Identify one specific change in which species share a genus.
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.