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Unit 2 Genetics and Adaptation

Unit 2 Genetics and Adaptation. Meiosis: haploid gamete formation. Meiosis: haploid gamete formation. By the end of this lesson you should be able to do the following: State that meiosis is a type of cell division that produces gametes.

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Unit 2 Genetics and Adaptation

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  1. Unit 2 Genetics and Adaptation Meiosis: haploid gamete formation

  2. Meiosis: haploid gamete formation • By the end of this lesson you should be able to do the following: • State that meiosis is a type of cell division that produces gametes. • Explain the meaning of the terms diploid and haploid in relation to gamete mother cells and gametes. • State the location of gamete mother cells in mammals and flowering plants. • Describe the two consecutive divisions of meiosis with the use of diagrams.

  3. Meiosis • Meiosis is a type of cell division which produces gametes. • Meiosis occurs only in gamete mother cells and it results in variation.

  4. Gamete mother cells • Gamete mother cells are diploid. This means they contain two sets of chromosomes (2n). • Gamete mother cells undergo meiosis to produce gametes.

  5. Gametes • Gametes (sex cells) are haploid which means they contain one set of chromosomes (n). • Gametes fuse together during fertilisation to form a zygote.

  6. Task • Copy and complete the following table using p82 of the Higher Biology text book.

  7. Task • Without using your notes, work in pairs to complete the “haploid / diploid cell” diagram from your pack.

  8. Process of meiosis • Meiosis consists of two consecutive divisions. • The first reduces the chromosome number by half. • The second produces four genetically different gametes.

  9. First meiotic division

  10. Task • Complete the “meiosis- 1st division” diagram from your pack. • Use p 80 of the Higher Biology text book to help.

  11. Second meiotic division

  12. Task • Complete the “Meiosis- 2nd division” diagram from your pack. • Use p81 from the Higher Biology text book to help.

  13. Can you do the following? • State that meiosis is a type of cell division that produces gametes. • Explain the meaning of the terms diploid and haploid in relation to gamete mother cells and gametes. • State the location of gamete mother cells in mammals and flowering plants. • Describe the two consecutive divisions of meiosis with the use of diagrams.

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