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Mitosis - PowerPoint PPT Presentation


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Mitosis. Cell Growth Cycle DNA replicated in S phase mitosis occurs in M phase. Structure of chromosome . Structure of chromosome. Mitosis the process of one cell making two identical daughter cells . Phases of Mitosis Prophase Metaphase Anaphase Telophase PMAT. prophase

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Presentation Transcript
slide2

Cell Growth Cycle

    • DNA replicated in S phase
    • mitosis occurs in M phase
slide5

Mitosis

    • the process of one cell making two identical daughter cells
slide6

Phases of Mitosis

    • Prophase
    • Metaphase
    • Anaphase
    • Telophase
    • PMAT
slide7

prophase

    • chromatin condenses into chromosomes
    • sister chromosomes bound by centromere
slide8

prophase

    • sister chromosomes (chromatids) bound by centromere
    • spindle fibers bind centromeres to the centrioles
slide9

metaphase

    • centromeres align along the equator of the cell
slide10

anaphase

    • sister chromatids separate
    • spindle fibers pull chromosomes towards the centrioles
slide11

telophase

    • sister chromatids attach at opposite ends of the cells
    • both sets form new nuclei; unfold back into chromatin
slide12

Cytokinesis

    • process of splitting the cytoplasm
    • cleavage furrow starts at the ‘equator’ of the cell
slide13

Cytokinesis

    • cleavage furrow starts at the ‘equator’ of the cell
    • cleavage furrow splits cells in half
slide14

Results of Mitosis

    • two identical daughter cells
    • all organelles and cytoplasm split evenly
slide17

Cytokinesis in plants

  • plant cells do not have use a cleavage furrow to separate
  • plants use a cell plate to split parent cell in two
  • the cell plate becomes the cell wall of the two daughter cells
slide19

Ploidy

    • number of sets of chromosomes in a cell
  • monopliod (hapliod): n
    • single set of chromosomes
  • dipliod: 2n
    • two sets of chromosomes
slide20

Ploidy

  • human hapliod number?
        • 23
  • human diploid number?
        • 46
      • most all human cells are diploid,
      • 46 chromosomes
slide23

Ploidy

  • When is a cell at n? 2n?
  • G1 – n
  • S phase/G2/part of M phase – 2n