Mitosis

• What is mitosis?


  • process of cell division in which a single cell divides into two identical daughter cells.
• What is mitosis needed for?


  • Growth and repair of damages tissues
• What are the stages of mitosis?


  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
• What happens in prophase?


  • Chromosomes condense , get shorter and wider
  • centrioles moves to opposite ends of poles of cell- dorms network of fibres called spindle
  • nuclear envelope breaks down and chromosomes lie free in cytoplasm
• What happens in metaphase?


  • Chromosomes line up along equator of cell and become attached to spindle by their centromere
• What happens in anaphase?


  • Centromere divide, separating each pair of sister chromatids
  • spindles contract to opposite poles of spindle- centromere first
  • makes chromatids appear V-shaped
• What happens in telophase?


  • Chromatids reach opposite ends of poles on spindle
  • uncoil and become long and thin again- now chromosomes
  • nuclear envelope forms around each group of chromosomes
  • cytokinesis finishes in telophase
  • 2 genetically identical daughter cells