### Cell Division Notes

```EOC Level2
Cell Growth & Division
Why do you think cells need to divide?
Cells divide for three reasons…
1. Growth of organism
DNA cannot function in a
large cell.
Materials cannot be
transported through the cell
fast enough.
2. Repair of tissues
3. Reproduction
Consequences of Large Cells
1. SA:V ratio gets
smaller; things cannot
get in and out of the cell
quick enough.
2.Large animals do not
have large cells.
Figure 4.2 Why Cells Are Small (Part 1)
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Cell Cycle
Interphase (longest part of
the cell cycle)
Interphase includes all the
time that the cell is not
dividing.
G1 (Growth 1)
S (Synthesis) - DNA copies
G2 (Growth 2) - cell
prepares for division
Mitosis-nucleus divides
Cytokinesis-cell divides
Egg Donation News Feature
Why We Should Exercise
Assignment- Exit Slip
Calculate the surface area to volume ratio for a cuboidal
cell with 1.5cm, 2.5cm, 4cm, and 10cm.
Predict what problems a 10cm cell would have vs. a 1.5
cm cell would have.
Assignment- Exit Slip
Read 10.1 and 10.2 complete all section questions. p240
Calculate the surface area to volume ratio for a cuboidal
cell with 1.5cm, 2.5cm, 4cm, and 10cm.
Predict what problems a 10cm cell would have vs. a 1.5
cm cell would have.
Explain why scientists are interested in SC when your body can
replicate its own cells.
Propose another alternative to SCR relating to cell division.
List two ways researchers can use stem cells to help people.
Anticipatory Set 11-12-13
___ Which of the following is a requirement for
all active transport processes?
B. ATP
C. AFP
D. AQP
Analyze the diagram above, what process is taking
place, and what type of cell transport process is this?
A. phagocytosis, passive transport
B. phagocytosis, active transport
C. receptor mediated endocytosis, passive
transport
D. exocytosis, active transport
Using the diagram, the process that will occur
following the process shown in the diagram to
expel any unneeded contents would most likely
be? (B.1.g, DOK2)
A. endocytosis
B. pinocytosis
C. exocytosis
D. phagocytosis
Read and List 2 reasons the nucleus
divides.
Mitosis is the process of nuclear division. The
cell divides because the DNA would not be able
to code for all the traits necessary of a large cell,
and because substances can not enter and exit
a cell fast enough
mitosis animation
mitosis song
How cancer works
Interphase
The longest period of the
cell cycle.
DNA duplicates during this
phase.
Centrioles divide.
Centrioles are a type of
cytoskeleton that is only
visible when the cell is
dividing. Otherwise they
are incognito.
After interphase mitosis begins
What is dividing in mitosis?
Prophase
Step 1 of mitosis
Centrioles separate.
Spindle fibers form.
Nucleus disappears.
Chromosomes tighten up
and prepare to move.
Metaphase
Step 2 of mitosis
Chromosomes line up in
the center of the cell.
Chromosomes connect
to spindle fibers at their
centromere.
Anaphase
Step 3 of mitosis
Chromosomes are pulled
by the spindle fibers to
opposite ends of the cell.
Telophase
Step 4 of mitosis
Chromosomes separate.
Two nuclei reform
Cytokinesis
Following mitosis,
cytokinesis occurs.
Cytoplasm pinches in
half and two identical
daughter cells result.
In plant cells a cell plate
will form
Mitosis Greenday Song
Review of the Cell Cycle
1.Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
Name that Phase
Interphase
Prophase
Metaphase
List the 6 stages of the cell cycle, and
circle the stages that include mitosis.
Anaphase
Telophase
Review of the Cell Cycle
1.Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
Mitosis Animation I- Cells Alive
Mitosis Animation II-Higher Ed
Mitosis Animation III-Hybrid
11-27-11
1. What three reasons cause the cell to divide?
Calculate the change of concentration of
hydrogen in a pH of 2 to a pH of 5.
Calculate SA:V ratio for a cube cell with a length
of 5nm.
CREATE THIS BY END OF CLASS!
Use two colors of paper to complete the
following:
Diagram and label the 6 stages of the cell cycle (one
color for interphase and cytokinesis, one color for 4
stages of mitosis
Describe what is happening in each stage.
Use the yarn to make spindle fibers and colored
paper to make chromosomes.
Must have 3 chromosomes per diagram.
Mitosis Math
What is the longest phase of the cell cycle?
What % of the cell’s life does it comprise?
What is the shortest phase of the cell cycle?
What % of the cell’s life does it comprise?
Cancer
The inability of cells to regulate cell division.
Cancer = uncontrolled cell division.
Tumors = result in masses of cells that have
uncontrollably divided.
Many factors such as tobacco, radiation, and
some viruses may lead to the breakdown of cell
division regulation.
Cancer
Craniotomy
SOLVE the Problem
Amazing Pass
Calculate the following: Show equation
Below are given the length of a cell’s life. Calculate the
amount of time it spends in Interphase and mitosis.
1. 9 days
9. 3 months
2. 4 hours
10. 10 minutes
3. 16 days
11. 15 months
4. 2 years
12. 3 years
5. 5 minutes
13. 14.5 days
6. 17 hours
14. 19.2 months
7. 40 months
15. 3.1 years
8. 18 days
Mitosis vs. Meiosis
MITOSIS
Somatic cell division
chromosomes from mom and
diploid.
MEIOSIS
Sex cell division
chromosomes from mom and
half the starting number
(haploid=n)
Sex cells can only have
_______ a set of chromosomes
because they will fuse and form
________. ½ + ½ = 1
Meiosis Animation-Cells Alive
Meiosis Animation II
Exit Slip
Draw the process of meiosis as shown on page
276, and give a brief description of each phase.
Know its time to dance
Vocabulary List #7
Mitosis- somatic cell
division
Meiosis- sex cell division
Anerobic- without oxygen
Aerobic- with oxygen
Ose- sugar
Ase- enzyme
DNA- deoxyribonucleic
acid
Nucleotide- monomer of
DNA
Double helix- twisted