Skin cancer develops most often on skin exposed to the sun. It is the abnormal growth of skin cells that don't know when to stop multiplying, forming tumors. The cell life cycle consists of interphase, where cells perform normal functions, and mitosis, where cells divide into two daughter cells through the stages of prophase, metaphase, anaphase and telophase, followed by cytokinesis where the cell physically splits.

2. Skin cancer - the abnormal
growth of skin cells - most
often develops on skin
exposed to the sun.
 1. Growth –from a baby to an adult – you need more cells.
 2. Repair – if you get a cut – you need more cells to fill in the
cut.
 3. Replacement – when cells die – they need to be replaced.
 Fun fact: Skin cancer is the abnormal growth of cells – they
don’t know when to stop making more – this produces a tumor.

3. The cell life cycle
consists of:
 Interphase -normal activities for the cell
 Mitosis (5 steps):
1.Prophase – nucleus dissapears
2. Metaphase – chromosomes line up
3. Anaphase – chromosomes separate
4. Telophase – nuclei form
 Cytokinesis - cell splits in two
 Back to Interphase – normal activities for the cell

4. Yes,
draw this
diagram!


5. • G1 phase: Cell grows in size
• S phase: Chromosomes are
copied - the number doubles.
(In the microscope, DNA
appears as threadlike
spaghetti called chromatin).
• G2 phase: Cell double checks
that DNA has been copied and
cell has enough organelles for
the upcoming split
Draw this

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

7. • Nucleus starts to
disappear.
• DNA Chromatin coils up
into chromosomes.
• Centrioles appear and
begin to move to opposite
end of the cell.
• Spindle fibers form
between the poles.
centriole
Draw this

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

10. • Chromosomes are
dragged to middle of
cell along the
metaphase plate.
Centriole
Don’t draw this

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

13. • Chromatids separate
and begin to move to
opposite ends of the
cell.
Sister
chromatids
Draw this

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

16. • Two new nuclei form.
• Chromosomes unwind into
chromatin.
• Mitosis ends.
Draw this

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

19. • Cell membrane
moves inward
to create two
daughter cells
– each with its
own nucleus.
• In plant cells, a
cell plate forms
in between the
daughter cells.
Draw this

20. • The cell wall makes plant cells rigid, so they can’t move inward
and separate like animal cells can.
• Vesicles filled with cell wall parts are towed to the middle of the
cell.
• They fuse together, forming a “cell plate.”
• The cell plate becomes the new cell wall.

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

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