Mitosis and Meiosis

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Mitosis and Meiosis
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Five Steps of Mitosis

• Prophase
• Metaphase
• Anaphase
• Telophase
• Cytokinesis

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Important Facts

• Mitosis begins with one cell that contains 96
  chromosomes (after duplication of the DNA).
• At the end there are two cells that contain 46
  chromosomes each.

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Prophase
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Metaphase
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Anaphase
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Telophase and Cytokinesis
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Plate Formation

• This occurs only in plants, which have cell walls.

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Meiosis

• Meiosis has two phases known as I and II.
• They contain all of the phases of mitosis, but
  for two different phases.
• At the beginning you have one cell that contains
  96 chromosomes (it has twice as many as mitosis
  because it will split twice).
• At the end you have 4 cells that have 23
  chromosomes each. These cells (gametes) will
  eventually pair up with other gametes from the
  opposite sex to form a zygote during the process
  of fertilization.
• 23 23 46 (complete human cell)

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Meiosis I Cycle
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Meiosis II Cycle
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Prophase I
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Prometaphase I
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Metaphase I
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Anaphase I
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Telophase I
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Cytokinesis
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Differences Between Mitosis and Meiosis

• Mitosis is used to make new regular body cells.
• Meiosis is used to create gametes or sex cells
  that will go on to be one-half of a future human
  being.