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Powerpoint   mitosis 1 Powerpoint mitosis 1 Presentation Transcript

  • Have your body changed in the pass six months? Tall/Weight
  • Are you taller?
  • Did your hair grow?
  • Clip your toenails?
  • Broken a bone recently?
  • Wound – how does your body repair itself?
  • Mitosis
    Definition:
    To create two identical daughter cells that are genetically identical to the parent cells
  • Q: What kind of cells would perform mitosis?
    A: Somatic cells
    (all body cells except gamete cells)
  • Acronym for MITOSIS
    IPMAT (C)
    Interphase
    Prophase
    Metaphase
    Anaphase
    Telophase
    (Cytokinesis)
  • IPMAT (C)  IPMAN ©
    Interphase
    Prophase
    Metaphase
    Anaphase
    Telophase
    (Cytokinesis)
  • Mitosis Video 1
  • Chromosome in Mitosis
    Homologous chromosome and sister chromatids
  • Anaphase
    Centromere splits and homologus chromosomes
    go to opposite poles of cell
  • Interphase
  • Interphase
    • Interphase is not part of mitosis
    • It involves synthesis of new organelles (G1), replication of chromosome (S) and synthesis of proteins necessary for mitosis (G2).
    • Chromosomes appears as thread-like structures called chromatin.
  • Prophase
  • Prophase
    • Chromatids (replicated chromosomes condense and become visible in a light microscope)
    • The nucleolus disappears
    • Paired centrioles (centrosomes) move opposite ends of the cell
    • Spindle forms
    • Asters (short microtubules radiating from centrioles) form
  • Metaphase
  • Metaphase
    • Sister chromatids line up at the spindle equator
    • Each centromere attaches itself to the spindle fibre
    • At the end of metaphase, the centromeres divide.
  • Anaphase
  • Anaphase
    • The separated chromatids, now called chromosomes are pulled apart towards the opposite poles by the contraction of spindle fibres
    • Anaphase is completed when chromosomes arrive at the poles
  • Telophase
  • Telophase
    • Chromosomes reach the poles of the cell and cannot be seen clearly
    • The spindle fibres disappear and centrioles replicate
    • Nuclear membrane re-forms around chromosomes and the nucleolus reappears in each nucleus
    • Telophase may lead straight into cytokinesis
  • Cytokinesis
    • Cytokinesis is the separation of the parent cell’s cytoplasm at the end of a mitosis
    • Cytokinesis in animal and plant cells are different
    • In animal cell:
    • CLEAVAGE FURROW (division furrow)
  • Group activity
  • Acronym for MITOSIS
    IPMAT (C)
    Interphase
    Prophase
    Metaphase
    Anaphase
    Telophase
    (Cytokinesis)
  • IPMAT (C)  “IPMAN ©”
    Interphase
    Prophase
    Metaphase
    Anaphase
    Telophase
    (Cytokinesis)
  • Interphase
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
  • Mitosis Video 1
  • Mitosis Video 2