Scientists investigated the effect of a treatment on cultured animal cells. They examined one sample before the treatment and another sample after the treatment.
| Sample | Total cells counted | Cells in mitosis | Cell-cycle time |
|---|---|---|---|
| Before treatment | 160 | 12 | 20 hours |
| After treatment | 150 | 24 | 15 hours |
Calculate how many times as long mitosis lasts after the treatment as before the treatment.
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.