A single fertilised egg cell divides by mitosis. Each cell produced then divides again, and this is repeated. The table shows the number of cells present after each round of cell division.
Table: The number of cells present after each round of cell division, starting from one fertilised egg cell
| Number of rounds of cell division | Number of cells present |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 |
Complete the table.
One round of cell division takes 20 hours. Calculate the time taken for one fertilised egg cell to produce 64 cells. Give your answer in hours.
After many rounds of cell division the cells of the embryo are no longer all the same. Explain how the cells can become different from each other, even though mitosis produces genetically identical cells.
63 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.