Mitosis

2. How do little elephants grow up to be BIG
elephants?

3. • Multicellularity
• We all start out as
a single cell
• Key Concept:
Growth occurs when
more cells are
made, NOT
because cells get
bigger.

4. Skin cancer - the abnormal
growth of skin cells - most
often develops on skin
exposed to the sun.

5. Mitosis Notes
http://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesishttp://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?
it=swf::535::535::/sites/dl/free/0072437316/120073/bio14.swf::Mitosis%20and
The cell life cycle consists of:

6. G2: Cell double-
checks to make
sure DNA is
replicated and
cell has enough
organelles for
the upcoming
split
G1: Cell grows in
size.
S: Cell makes
identical copy
of its DNA
M: mitosis (Cell divides)

7.  What are the three phases of
Interphase?
 What happens during G1 phase?
 What happens during S phase?
 What happens during G2 phase?

8. Animated Mitosis Cycle
http://www.cellsalive.com/mitosis.htm
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?

9.  What is binary
fission?
 Why does the
DNA need to
move to
either side of
the cell
before the
cell divides?

10. • Chromosomes are copied
(# doubles)
• Chromosomes (DNA)
appear as threadlike
spaghetti called
chromatin

11. Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

12. • Nucleus starts to
disappear.
• Chromatin coils to
become chromosomes.
• Centrioles (or poles)
appear and begin to
move to opposite end
of the cell.
• Spindle fibers form
between the poles.
centriole

13. Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles

14. • Chromatids are
dragged to middle of
cell along the
metaphase plate.
Centriole

15. Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

16. • Chromatids (or pairs
of homologous
chromosomes)
separate and begin
to move to opposite
ends of the cell.
Sister
chromatids

17. Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

18.  What are the
steps of
mitosis?
 What is the
spaghetti –like
DNA called?
 What is the
coiled,
bundled DNA
called?

19. • Two new nuclei form.
• Chromosomes unwind
into chromatin (threads
instead of bundles).
• Mitosis ends.

20. Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

21. • Cell
membrane
moves inward
to create two
daughter cells
– each with its
own nucleus.

22. Cytokinesis is
different in plants!

25. Animal Mitosis -- Review
Interphase Prophase
Metaphase Anaphase
Telophase Interphase

26. Plant Mitosis -- Review
Interphase Prophase
Metaphase Anaphase
Telophase Interphase

27. 28

28. 29
Quiz time! Can you fill in the blanks?
29

29. http://www.cellsalive.com/mitosis.htm