Mitosis

• Types of cells in the body

  Stomatic - Division = Mitosis

  Gametic - Division = Meiosis
• When cell is not dividing

  Chromatin
• When cell is dividing

  Chromosomes
• Function of Mitosis


  -Growth

  -Replacement of damaged/worn tissues

  -Asexual reproduction
• The Cell Cycle


  Interphase - preparing cell for mitosis

  Mitosis

  Cytokinesis
• Phases of Mitosis

  Prophase, Metaphase, Anaphase, Telophase
• Interphase


  *The period between cell divisions

  *Cell grows and DNA is replicated

  *Chromatin network

  
• Prophase


  *Chromatin network shortens and thickens (Chromosomes)

  *DNA is replicated

  *Nuclear membrane and nucleolus disappears

  *Centrioles double and move to poles

  
• Metaphase


  *Chromosomes move to the equator

  *Spindle fibres attach to centromere

  
• Anaphase


  *The spindle fibres shrink and splits the centromere in two

  *Chromatids separate and move to opposite poles

  *Chromatids are known as daughter chromosomes

  
• Telophase


  *Chromatin network reforms

  *Nuclear membrane and nucleolus reforms

  *Nucloeplasm begins to divide (invagination) - cytokenisis

  
• Cytokinesis


  *The cytoplasm completely splits to form two separate cells

  *All other organelles copy and split

  *Two identical daughter cells

  
• The chromosomal number stays the same during mitosis
• Mitosis definition

  Mitosis is the division of somatic cells that creates two exact duplicates of the nucleus
• Cytokinesis in animal cells

  • Cytokinesis is the division of the cytoplasm.
  • It occurs once two new nuclei are formed.
  • In animal cells the cell membrane constricts.
  • The constriction eventually meet in the middle forming two new cells.
• Cytokinesis in the plant

  • A cell plate forms between the two new nuclei.
  • The cell plate divides the cell into two new identical cells.