Mitosis

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Mitosis

• Ch 8. 2 Cell Division

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Cell Cycle

• Interphase
• G1 Cell grows
• S DNA replicates
• G2 Organelles replicate

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Mitosis

• The process of dividing nuclear material

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VocabWRITE THESE DEFINITIONS ON TOP OF YOUR
NOTES!

• Microtubules protein structures that are part of
  a cells cytoskeleton
• Spindle a bundle of microtubules that separate
  chromosomes during mitosis
• Centriole microtubule structure that helps
  organize the spindle fibers during cell division
• Aster microtubules surrounding the centriole

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Prophase

1. Chromosomes become visible.
2. Centrioles move to opposite poles of the cell.
3. Microtubules extend from the centrioles to form
   asters

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Prophase

1. Microtubules form spindle fibers.
2. Spindle fibers become attached to centromeres.
3. Nuclear membrane disappears.

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Metaphase

1. Centromeres of the chromosomes line up on the
   equator.

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Anaphase

1. Centromeres divide.
2. Chromatids move to opposite poles.

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Telophase

1. Chromosomes reach the poles of the cell.
2. Chromosomes uncoil.
3. Spindle and asters disappear.
4. Nuclear membrane forms.

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Cytokinesis (in animals)

1. Begins during late anaphase.
2. Cytoplasm is pinched off by cell membrane.
3. Results in two new cells.

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Mitosis in plants

• Main events are the same
• Plants dont have centrioles or asters.
• In cytokinesis, a cell plate forms between the
  new cells.

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The Rate of MitosisWRITE THESE DOWN!

• Cells undergo mitosis at different rates.
• Mitosis speeds up during an injury.
• Mitosis slows down with aging.
• Cells that undergo very fast uncontrolled mitosis
  form cancer.

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Name the stage of each cell.
A
C
D
B