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Mitosis
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Transcript

  • 1. Mitosis and the Cell Cycle Cell reproduction
  • 2. Today’s Objectives
    • The student will be able to identify the phases of the cell cycle and mitotic stages by description and or graphic representation.
    • The student will be able to identify mitotic stages by photomicrograph.
  • 3. Some Definitions
    • Somatic Cells – body cells
      • Produced through mitosis
      • Has 46 chromosomes (23 pairs)
    • Homolog – each member of a chromosome pair
    • Diploid (2n) – total of 46 chromosomes in people – zygote & somatic cells
    • Haploid (n) – total of 23 chromosomes in people, gametes (sperm & egg)
  • 4. The Cell Cycle
    • The sequence of growth and division of a cell.
    • 95% of cell cycle in interphase
    • 5% of cell cycle in mitosis
  • 5. Interphase
    • Growth Stage 1 (G 1 ) – metabolic activity of the cell
    • Synthesis Stage (S) – metabolic activity of the cell, replication of DNA
    • Growth Stage 2 (G 2 ) – metabolic activity of the cell, prepare for division
  • 6. Mitosis
    • Happens in all cells
    • Cell division process
    • 5 major stages
  • 7. Prophase
    • Nuclear envelope disappears
    • Chromosomes condense – can see sister chromatids
    • and centromere
    • Spindle forms
  • 8. Metaphase
    • Chromosomes move to the equator of spindle
    • Each chromatid is attached to spindle with centromere
  • 9. Anaphase
    • Centromeres split
    • Sister chromatids are pulled apart to opposite poles of the cell
    • Each chromatid is now a separate chromosome
  • 10. Telophase
    • Nuclear envelopes (2) reform
    • Chromosomes begin to uncoil
  • 11. Cytokinesis
    • Cytoplasm divides
    • Two new daughter cells are now separate