Year 10 - Science
Making gametes: meiosis
Cell division: mitosis and meiosis
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers mitosis and the cell cycle in growth, cancer as uncontrolled cell division, and the role of mutations in genetic variation. It explains meiosis in gamete formation and chromosome reduction. The emphasis is on recording observations and interpreting patterns to draw conclusions.
Lesson Summary
You will learn to explain how a type of cell division called meiosis makes gametes for sexual reproduction.
Key Notes
- Reproduction is part of the life cycle of all organisms; sexual reproduction requires specialised cells called gametes.
- Gametes are made from body cells by a type of cell division called meiosis.
- During interphase the chromosomes are copied; meiosis follows this and includes two rounds of cell division.
- The gametes made by meiosis have half the usual number of chromosomes (one from each pair in the original body cell).
- Mitosis produces 2 genetically identical diploid cells, whereas meiosis produces 4 genetically different haploid cells.
Vocabulary To Learn
- sexual reproduction: A type of reproduction that combines the genetic material of two organisms to produce genetically different offspring.
- gametes: An organism's sex cells that contain half the number of chromosomes.
- meiosis: A type of cell division that forms the gametes.
- chromosomes: Highly coiled strands of DNA found inside the nucleus of eukaryotic cells.
- haploid: A cell with half the number of chromosomes.
Common Mistakes To Avoid
- Knowing the differences between mitosis and meiosis. In particular when they are used, the number of cell divisions and if variation is present.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Reproduction is part of the life cycle of all organisms; sexual reproduction requires specialised cells called gametes. Gametes are made from body cells by a type of cell division called meiosis.
2. Define this scientific word and use it in context. 'sexual reproduction'
A type of reproduction that combines the genetic material of two organisms to produce genetically different offspring. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Knowing the differences between mitosis and meiosis. In particular when they are used, the number of cell divisions and if variation is present. Correction: The final learning cycle of the lesson serves to compare the features of mitosis and meiosis, this includes CFU questions and a practice task.
More Lessons In This Unit
- Errors in cell division and cancer: basics Study Guide
- Errors in cell division and cancer: beyond the basics Study Guide
- Growth in multicellular organisms Study Guide
- Observing mitosis in plant cells using a light microscope Study Guide
- Observing mitosis in plant cells using a light microscope (including PMAT) Study Guide
- The cell cycle and cell division: mitosis Study Guide
- The cell cycle and cell division: mitosis (including PMAT) Study Guide
- The structure of DNA: including nucleotides Study Guide
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