Nscu 302 wk 2 5

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Nscu 302 wk 2 5

  1. 1. Mitosis and Meiosis Higher Biology
  2. 2. Mitosis and Meiosis • Mitosis: -division of somatic (body) cells • Meiosis -division of gametes (sex cells)
  3. 3. Mitosis • Interphase • Prophase • Metaphase • Anaphase • Telophase
  4. 4. Interphase • Interesting things happen! 1. Cell preparing to divide 2. Genetic material doubles
  5. 5. Prophase • Chromosome pair up! 1. Chromosomes thicken and shorten -become visible -2 chromatids joined by a centromere 2. Centrioles move to the opposite sides of the nucleus 3. Nucleolus disappears 4. Nuclear membrane disintegrate
  6. 6. Metaphase • Chromosomes meet in the middle! 1. Chromosomes arrange at equator of cell 2. Become attached to spindle fibres by centromeres 3. Homologous chromosomes do not associate
  7. 7. Anaphase • Chromosomes get pulled apart 1. Spindle fibres contract pulling chromatids to the opposite poles of the cell
  8. 8. Telophase • Now there are two! 1. Chromosomes uncoil 2. Spindle fibres disintegrate 3. Centrioles replicate 4. Nucleur membrane forms 5. Cell divides
  9. 9. Meiosis • 4 daughter cells produced • Each daughter cell has half the chromosomes of the parent • 2 sets of cell division involved

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