Mitosis Cell division http://www.brainpop.com/health/bodysystems/cells/ w.brainpop.com/science/cellularlifeandgenetics/cell
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Mitosis
Cell division
http://www.brainpop.com/health/bodysystems/cells/
http://www.brainpop.com/science/cellularlifeandgenetics/cellstructures/
Cell division
All complex organisms originated from a single fertilized egg.
Every cell in your body started here, through cell division the numbers are increased
Cell then specialize and change into their various roles
Mitosis
Mitosis is the process by which new body cell are produced for:GrowthReplacing damaged or old cells.
Cell division occurs in a series of stages, or mitosis.
2 daughter cells identical to original
Parent cell
Chromosomes are copied and double in number
Chromosomes now split
Animated Mitosis Cyclehttp://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
Interphase occurs before mitosis begins
• Chromosomes are copied (# doubles)• Chromosomes appear as threadlike coils
(chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANENucleus
Cytoplasm
InterphaseInterphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Prophase 1st step in Mitosis
• Mitosis begins (cell begins to divide)
• Centrioles (or poles) appear and begin to move to opposite end of the cell.
• Spindle fibers form between the poles.
CentriolesSister chromatids
Spindle fibers
Prophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
Metaphase 2nd step in Mitosis
• Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers
Metaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Anaphase 3rd step in Mitosis
• Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers
Anaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Telophase 4th step in Mitosis
• Two new nuclei form.
• Chromosomes appear as chromatin (threads rather than rods).
• Mitosis ends.
NucleiNuclei
Chromatin
Telophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Cytokinesisoccurs after mitosis
• Cell membrane moves inward to create two
daughter cells – each with its own nucleus with identical chromosomes.
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- ReviewInterphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
20
Cell Cycle
21
- Cell Division
The Cell Cycle
21
Mitosis Animation
http://www.cellsalive.com/mitosis.htm
Mitosis
All daughter cells contain the same genetic information from the original parent cell from which it was copied.
Every different type cell in your body contains the same genes, but only some act to make the cells specialize – e.g. into nerve or muscle tissue.
Mitosis – bone cell slides
1 2
3 4 5
Parent cell Chromosomes copied
Copies separating 2 daughter cells
Cells split
Plants
Rat – epithelial cells
http://www.brainpop.com/science/cellularlifeandgenetics/mitosis/
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