MITOSIS

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MITOSIS
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Review

• Which cells use Mitosis?
• All but the sex cells, muscle and nerve cells
• For example skin, cheek, plant cells
• How many cells does Mitosis create?
• 2 daughter cells
• Are the cells diploid or haploid?
• Diploid because have two pairs of chromosomes

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Stages of Mitosis
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Mitosis
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Interphase

• Takes up the majority of the cell Cycle time
• During Interphase most of the cells life
  activities are taking place
• Growth
• Metabolism (Breakdown of food)
• Chromosomes are duplicated
• Growth and final preparations for division

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Mitosis

• The last part of the cell cycle is called Mitosis
• Mitosis includes the last 4 phases of the cell
  Cycle
• Prophase
• Metaphase
• Anaphase
• Telophase

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Prophase

• Longest phase of mitosis
• The nucleus begins to disappear
• Chromatin coils up to form Sister Chromotids
• The sister chromatids are identical to the parent
  cells DNA
• The halves are connected by a Centromere

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Prophase Cont

• 2 Centrioles appear and migrate to the edges of
  the cell
• Spindle fibers begin to form between the
  Centrioles and help pull apart the sister
  chromatids

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Metaphase

• The 2nd and shortest phase of mitosis
• The Chromosomes attach to the spindle fibers by
  the centromeres
• The chromosomes line up in the middle of the cell

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Anaphase

• The 3rd phase of Mitosis
• The sister chromotids begin to break apart at the
  centromeres
• Chromatids move towards the centrioles

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Telophase

• The 4th phase of mitosis
• The chromatids reach the edges of the cell
• The cell begins to uncoil the chromosomes
• The uncoiled chromosomes then begin telling the
  cell what to do
• The nucleus is reformed
• The plasma membrane begins to separate into 2
  cells

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Mitosis Video
http//www.youtube.com/watch?vVlN7K1-9QB0