Cell Cycle - PowerPoint PPT Presentation

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Cell Cycle

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Cell Cycle & Mitosis Chapter 6 Growth Development Reproduction Tissue repair Cell Division Cell Cycle Duplication of each chromatid Cell contains twice as much DNA as ... – PowerPoint PPT presentation

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Title: Cell Cycle


1
Cell Cycle Mitosis
Chapter 6
2
Cell Division
  • Growth
  • Development
  • Reproduction
  • Tissue repair

3
Cell Cycle
Duplication of each chromatid
Cell contains twice as much DNA as compared to
the cell when in G1
4
The Cell Cycle
  • Interphase
  • First growth (G1) phase Grows rapidly, carries
    out normal functions
  • Synthesis (S) phase
  • Second growth (G2) phase Growth and preparation
    for mitosis
  • Mitosis Nucleus is divided chromosomes
    divided
  • Cytokinesis Cytoplasm divides
  • The end result is 2 genetically identical
    daughter cells to parent cell

DNA is copied
5
Mitosis
  • Prophase Chromosomes coil, nuclear envelope
    dissolves and spindle forms
  • Metaphase Chromosome line up along equator.
  • Anaphase Centromeres divide and sister
    chromatids move toward opposite poles.
  • TelophaseNuclear envelope forms, chromosomes
    uncoil and cytokinesis begins.

6
Chromosomes
http//www.johnkyrk.com/chromosomestructure.html
  • Chromosomes DNA and proteins-histones (beads on
    a string)
  • Sister chromatids Two exact copies of DNA
  • Centromere Point where chromatids are attached

7
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8
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9
Mitosis in an Animal Cell
10
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11
Cytokinesis
12
Makes decision of whether cell will divide
Kinases-enzymes involved in triggering events in
the cycle
DNA replication checked by DNA repair enzymes
13
Growth Regulation Cancer
B/c cancer cells do not have anchorage dependence
they can go to other parts of the body thru the
bloodstream
Cancer-uncontrollable growth of cells
As cancer cells build up, they form tumors
14
Mitosis in a Plant Cell
http//www.johnkyrk.com/mitosis.html
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