http://www.brainpop.com/health/bodysystems/cells/
Mitosis
Cell division
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:
Growth
Replacing damaged or old cells.
Cell division occurs in a series of
stages, or mitosis.
Parent cell
Chromosomes are
copied and double
in number
Chromosomes
now split
2 daughter cells
identical to original
Animated Mitosis Cycle
http://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
Nucleus
CELL
MEMBRANE
Cytoplasm
Interphase
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.
Centrioles
Sister chromatids
Spindle fibers
Prophase
Animal Cell
Plant Cell
Spindle fibers
Centrioles
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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.
Nuclei
Chromatin
Nuclei
Telophase
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Cytokinesis
occurs 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 -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Cell Cycle
20
- Cell Division
The Cell Cycle
21
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
Chromosomes
copied
Parent cell
3
Copies separating
Cells
split
4
5
2 daughter cells
Plants
Rat – epithelial cells
http://www.brainpop.com/science/cellularlifeandgenetics/mitosis/