Cells in the lining of a mammal's mouth can be lost during feeding. Nearby cells divide by mitosis to replace them. At the start of an observation, there are 3 dividing cells. During each round, every cell divides once. Each original cell has 44 chromosomes in its nucleus. The researcher records the number of cells after each complete round of division.
| Complete rounds of division | 0 | 1 | 2 | 3 |
|---|---|---|---|---|
| Number of cells | 3 | 6 | 12 | 24 |
Calculate the number of cells after round 4.
Calculate the total number of chromosomes in the nuclei of all the cells after round 4.
Explain why the cells produced by mitosis have the same genetic information as the original cells.
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.