Transcript Spindle fibers

Mitosis and the Cell Cycle
Big Idea:
Mitosis is the process in which
the nucleus divides to form two
new nuclei and two cells with
identical DNA.
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How do little elephants grow up
to be BIG elephants?
Mitosis begins after
fertilization
1 cell becomes 2 cells, becomes
4 cells…becomes TRILLIONS
Why do cells make more cells?
Animated Mitosis Cycle
http://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
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•
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
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
Mitosis begins (cell begins to divide)
Centrioles appear and begin to move to
opposite end of the cell.
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Spindle fibers form between the centrioles.
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Centrioles
Sister chromatids
Spindle fibers
Animal Cell
Plant Cell
Spindle fibers
Centrioles
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
•
Chromatids (or pairs of chromosomes)
attach to the spindle fibers.
Centrioles
Spindle fibers
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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•
Chromatids (or pairs of chromosomes)
separate and begin to move to opposite
ends of the cell.
The separated chromatids are now called
chromosomes.
Centrioles
Spindle fibers
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
A new nucleus forms around each identical
groups of chromosomes at opposite sides of
the cell and two new nuclei form.
• Chromosomes appear as chromatin (threads
rather than rods).
• Mitosis ends.
•
Nuclei
Chromatin
Nuclei
Animal Cell
Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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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
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
IPMATC
I Prefer Meatloaf At Tennis Camp
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- Cell Division
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http://www.cellsalive.com/mitosis.htm
Name that phase:
A
C
B
D
E
F
Place these phases in order:
C
B
A
D
E
F
Name stage of mitosis
Name stage of mitosis
Name stage of mitosis
Name stage of mitosis
Name stage of mitosis
Name stage of mitosis