Scientists studied three strains of the same single-celled eukaryotic organism. The strains contained different sections of DNA from one chromosome.
The strains were grown under the same conditions.
| Strain | Section P present | Section Q present | Protein R detected | Colony colour |
|---|---|---|---|---|
| W | Yes | Yes | Yes | Red |
| X | No | Yes | No | White |
| Y | Yes | No | Yes | Red |
Explain which DNA section, P or Q, is most likely to be the gene that controls colony colour.
A fourth strain does not contain section P or section Q.
Explain which colony colour this strain is expected to have.
104 exam-style questions on AQA GCSE Biology 1.2 Cell division, covering 1.2.1 Chromosomes, 1.2.2 Mitosis and the cell cycle, and 1.2.3 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.