Transcript Cell Division PPT

Mitosis:
 PMAT
 Paco Made a Taco
All the steps:
 I, Punxsutawney Phil make all the calls
How do little elephants grow up to be BIG
elephants?
Skin cancer - the abnormal growth of
skin cells - most often develops on skin
exposed to the sun.
Cell that reproduce by asexual
reproduction reproduce constantly.
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
Cell increases in size and copies/doubles its
chromosomes to prepare for cell division.
Nucleus
CELL
MEMBRANE
Cytoplasm
Animal Cell
Plant Cell
Mitosis begins (cell begins to divide)
• Chromosomes appear
• Nuclear membrane disappears
• 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
Animal Cell
Spindle fibers
Plant Cell
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•
Chromatids (or pairs of chromosomes) attach
to the spindle fibers. Chromosomes line up in
the middle of the cell
Centrioles move to opposite poles.
Centrioles
Spindle fibers
Animal Cell
Plant Cell
•
Chromatids (or pairs of chromosomes)
separate and begin to move to opposite
ends of the cell.
Centrioles
Spindle fibers
Animal Cell
Plant Cell
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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 pinches inward in animal cells
to create two daughter cells – each with its
own nucleus with identical chromosomes. In
plant cells, a cell plate forms to divide the one
cell into two identical daughter cells.
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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- Cell Division
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http://www.cellsalive.com/mitosis.htm