The Cell Cycle

1
The Cell Cycle

• The Life Cycle of a cell includes Growth,
  Development, and Reproduction

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Importance of Cell Division

• Growth of Organism
• Repair
• Reproduction for some organisms

3
Phases of the Cell Cycle

• 1. Interphase
• Growth and normal functions (G1)
• DNA replicates makes a copy of
• itself (S)
• Sister chromatids are held together by the
  centromere
• Organelle replication

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Interphase
5

• 2. Mitosis
• Prophase
• DNA condenses forming chromosomes
• Nuclear membrane breaks down
• Spindle fibers form between centrioles

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Prophase
7
Mitosis continued

• Metaphase
• Replicated chromosomes line up across the middle
  of the cell
• Chromosomes attach to the spindle fibers at the
  centromere, which is still holding the chromatids
  together

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Metaphase
9
Mitosis continued

• Anaphase
• Spindle fibers pull the two chromatids in
  opposite directions causing the centromere to
  split
• Chromatids move to opposite sides
• Cell becomes stretched

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Annaphase
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Mitosis continued

• Telophase
• Chromatid unwind forming chromatin
• New nuclear membrane forms around each set of
  chromatin

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Telophase
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Cell cycle

• 3. Cytokinesis
• Cell membrane pinches together forming two cells
• Cell plate form in plant cells , eventually forms
  cell membrane and wall

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Cytokinesis
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Results of Cell Division

• Parent cell no longer exists
• Two daughter cells with identical DNA to the
  parent cell form

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The cell cycle
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Animal Mitosis -- Review
Interphase                                                              Prophase                                                             
Metaphase                                                              Anaphase                                                             
Telophase                                                              Cytokinesis                                                             
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Plant Mitosis -- Review
Interphase                                                              Prophase                                                             
Metaphase                                                              Anaphase                                                             
Telophase                                                              Cytokinesis                                                             
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The Cell Cycle