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This lesson covers the cell cycle, chromosomes and the process of mitosis as required by the AQA GCSE Combined Science Trilogy specification (8464). You need to describe the stages of the cell cycle, explain the importance of mitosis and understand what chromosomes are.
Chromosomes are thread-like structures found in the nucleus of eukaryotic cells. They are made of tightly coiled DNA (deoxyribonucleic acid).
| Cell Type | Number of Chromosomes | Ploidy |
|---|---|---|
| Human body cell | 46 (23 pairs) | Diploid (2n) |
| Human gamete (sperm or egg) | 23 | Haploid (n) |
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