Meiosis 15 September 2020 Learning Objectives 1 Explain

Meiosis 15 September 2020 Learning Objectives: 1. Explain how gametes are made by meiosis 2. Describe differences and similarities between mitosis and meiosis Starter Draw and label a sperm and egg cell in your book – don’t look back in your book!

Meiosis • A special type of cell division producing gametes • Happens in sex organs – Ovaries and testes • Gametes contain half the number of chromosomes. This is called haploid • Meiosis results in variation http: //www. cellsalive. com/meiosis. htm

Stages of meiosis

2 Main stages 1. Homologous chromosomes separated. Creates 2 daughter nuclei 2. 2 daughter nuclei divide. Chromosomes themselves are seperated. Creates 4 gametes.

Activity • Using pipe cleaners (4 different colours) OR string – model the stages of meiosis • Do this in your book. • Label your diagrams

Similarities and differences between meiosis and mitosis Mitosis Where does it occur Number of divisions Creates Number of chromosomes Produces Function Meiosis

Similarities and differences between meiosis and mitosis Meiosis Where does it occur All over the body Sex organs Number of divisions 1 2 Creates All cells apart from gametes Gametes Number of chromosomes 46 (diploid) 23 (haploid) Produces Two cells Four cells Function Cellular reproduction, growth Sexual reproduction

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