Little elephants grow up to be big elephants through cell growth and division. Cells multiply through mitosis, where the cell makes an identical copy of its DNA and divides into two daughter cells. This cell growth and division allows the elephant to increase in size as it matures, rather than cells individually increasing in volume. The document provides information about the cell cycle and process of 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