LESSON 4

• Mitosis


  This type of cell division produces two identical cells with the same number of chromosomes
• Four stages of mitosis

  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
• Prophase


  Duplicated centrioles begin to move in opposite poles and form spindle fibers between them and the Chromatin fibers become visible as they condense, coil and become shorter and thicker
• Metaphase


  The chromosomes migrate randomly and line up toward the equator
• Anaphase


  The sister chromatids separate and move towards the opposite ends
• Telophase


  The nucleus forms in both poles as new nuclear membrane forms around the new nucleus
• Cytokinesis


  The chromosomes are now at the opposite poles of the spindle fiber. There is a division of the cytoplasm to form daughter cells which we call cytokinesis
• The purpose of mitosis is to ensure that cells can grow, replace damaged or old cells, and maintain the correct number of chromosomes in the body