Chapter 18 Cell Division Lesson 1 - Introduction to Cell Division

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Chapter 18 Cell Division Lesson 1 - Introduction to Cell Division

  1. 1. Cell Division Chapter 18 Content • Mitosis • Meiosis
  2. 2. Introduction to cell division
  3. 3. Lesson Objectives <ul><li>At the end of this lesson, you should be able to: </li></ul><ul><li>state the importance of mitosis in growth, repair and asexual reproduction </li></ul><ul><li>explain the need for the production of genetically identical cells and fine control of replication </li></ul><ul><li>identify, with the aid of diagrams, the main stages of mitosis </li></ul><ul><li>state what is meant by homologous pairs of chromosomes </li></ul>
  4. 4. Lesson Objectives <ul><li>(e) identify, with the aid of diagrams, the main stages of meiosis (Names of the sub-divisions of prophase are not required) </li></ul><ul><li>(f) define the terms haploid and diploid , and explain the need for a reduction division process prior to fertilisation in sexual reproduction </li></ul><ul><li>(g) state how meiosis and fertilisation can lead to variation </li></ul><ul><li>Use the knowledge gained in this section in new situations or to solve related problems. </li></ul>
  5. 5. Growth <ul><li>Is a characteristic of all living things </li></ul><ul><li>Is a permanent increase in size </li></ul><ul><li>Is accompanied by cell division and differentiation to form tissues and organs </li></ul>
  6. 6. Differentiation <ul><li>Definition </li></ul><ul><li>The process during which young, immature (unspecialized) cells take on individual characteristics and reach their mature (specialized) form and function </li></ul>
  7. 8. How does growth take place in plants and animals? <ul><li>In plants </li></ul><ul><li>Growth is restricted to the tips of 1 roots and 2 shoots, known as growing points </li></ul><ul><li>The shoot and root tips can grow throughout the life of the plant </li></ul><ul><li>In animals </li></ul><ul><li>Growth occurs throughout the body </li></ul><ul><li>Most animals stop growing soon after reaching a certain age ( maturity ) </li></ul><ul><li>For a multicellular organism to grow normally, its cells must first divide. The cell division that takes place during growth is called mitosis </li></ul>

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