Download Cell Cycle and Mitosis Foldable

mitosis1.notebook
October 17, 2013
Mitosis­ division of the cell nucleus and its contents.
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mitosis1.notebook
October 17, 2013
Prophase
­longest stage of mitosis
Centromere
Sister chromatids
­Long, stringy chromatin coil up into visible chromosomes.
1. At the beginning of prophase the nucleus begins to disappear.
­nuclear envelope and nucleolus disintegrate.
2. In animal cells, centrioles begin to migrate to opposite ends
of the cell and spindle fibers begin to form.
Animal Cell
Plant Cell
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mitosis1.notebook
October 17, 2013
Metaphase
1. Chromosomes attach to the spindle fibers by the centromere.
2. Line up on the equator of the cell.
3. Each sister chromatid is attached to its own spindle fiber.
4. One sister's chromatid spindle fiber extends to one pole and the other to the opposite pole.
5. Important because it ensures each new cell receives an identical and complete set of chromosomes.
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mitosis1.notebook
October 17, 2013
Anaphase
1. Centromeres split apart and the chromatid pairs from each chromosome separate.
2. Pulled to opposite poles.
3. Chromatids are pulled apart by the shortening the spindle fibers.
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mitosis1.notebook
October 17, 2013
Telophase
1. Nuclear membranes start to form.
2. Chromosomes unwind.
3. Spindle fibers break down.
4. Cytokinesis begins
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mitosis1.notebook
October 17, 2013
Cytokinesis
Cytokinesis­ Division of cytoplasm.
Occurs near the end of telophase. Animal cells: The plasma membrane pinches in along the equator and the cells divide.
Plant cells: A cell plate is laid down across the equator. A plasma membrane forms around each cell and a new cell wall forms on either side of the plate until separation is complete.
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mitosis1.notebook
October 17, 2013
Important: Not all cells undergo mitosis. ­Mature roots, leaves and stems of plants
­Nerve cells and adult bone cells
Single­celled organisms use mitosis to reproduce.
Multicellular organisms use mitosis for growth, development and repair.
End Result: 2 genetically identical daughter cells.
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mitosis1.notebook
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