🎯 Common Question Types
- "Describe the stages of mitosis" (4-6 marks)
- "Explain why mitosis is important for growth" (2-3 marks)
- "Calculate the number of cells after n divisions" (2-3 marks)
- "Compare mitosis and meiosis" (4-6 marks)
- "Identify the stage of mitosis from a microscope image" (1-2 marks)
📝 Key Command Words
- Describe: Say what happens at each stage — chromosome behaviour
- Explain: Say why — link DNA replication to identical cells
- Compare: Give similarities AND differences (use a table)
- Calculate: Use 2ⁿ formula, show working
⚠️ Common Mistakes to Avoid
- Saying "chromosomes duplicate during mitosis" — they duplicate in interphase (S phase)
- Confusing chromatids with chromosomes — after separation, chromatids become chromosomes
- Forgetting cytokinesis — mitosis is nuclear division only; cytokinesis splits the cell
- Saying mitosis produces 4 cells — that's meiosis; mitosis produces exactly 2
- Only giving "growth" as a reason — always mention repair AND asexual reproduction too
📋 Edexcel 1BI0 Specific Advice:
- Edexcel Paper 1 (1BI0/1) — Topic 2 (Cells and Control) — frequently shows a photomicrograph of dividing cells; practise identifying stages from chromosome position, not just by name-recall
- For "explain how you identified this stage" questions, always describe what you can see: "the chromosomes are arranged along the equator" is a mark-worthy observation; "it is metaphase" alone is not
- When linking mitosis to cancer in Edexcel questions, use the phrase "uncontrolled cell division" — this is the key mark-scheme phrase
- Edexcel may ask you to "suggest an advantage of therapeutic cloning" — connect mitosis → genetically identical cells → no immune rejection risk
This exam tips covers Exam Tips for Mitosis within Mitosis and the Cell Cycle for GCSE Biology. Cell division by mitosis, cell cycle phases, chromosome behaviour, cytokinesis differences, stem cells, cancer, and practical investigations It is section 18 of 19 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Mitosis and the Cell Cycle
What is mitosis?
Describe what happens during interphase to prepare a cell for mitosis.
Quick recall flashcards
Give three reasons why cells divide
1. Growth - increasing cell numbers for organism development
2. Repair - replacing damaged or dead cells
3. Asexual reproduction - creating identical offspring
Define mitosis
Mitosis is the process of nuclear division that produces two genetically identical diploid cells from one diploid cell. It is used for growth and repair in multicellular organisms.