Transcript Cell Cycle Book PPT

Cell Division
Mitosis
Cell Cycle Resource Booklet
Interphase
Description : A period
of growth in which a
cell can spend 90% of
its time. This part of
the cycle is divided
into three phases:
G1, S, and G2.
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Interphase
Plant cell
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Interphase
Animal cell
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Interphase
Chromatin is a mass of genetic material composed of DNA
and proteins that eventually condenses to form chromosomes
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G1 (Gap 1)
Description : A period of activity in
which cells do most of their growing.
Cells increase in size and synthesize
new proteins and organelles.
The G1 checkpoint ensures that
the cell is large enough to divide,
and that enough nutrients are
available to support the resulting
daughter cells.
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S (Synthesis)
Description : Synthesis of DNA
molecules takes place as chromosomes
are replicated. Key proteins are also
synthesized.
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S (Synthesis)
DNA replication: Use the color code key to color the
replicating DNA strand in your resource book.
Nitrogenous Bases Color Key
Adenine
Guanine
Thymine
Cytosine
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G2 (Gap 2)
Description: Many organelles and
molecules required for cell division are
produced here. Once this phase is
complete, the cell is ready for mitosis.
The G2 checkpoint ensures that
DNA replication in S phase has
been completed successfully.
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Prophase
Description:

The chromatin condenses into
chromosomes.

The centrioles (in animals) separate, and a
spindle begins to form.

The nuclear envelope
breaks down.

Longest phase of mitosis.
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Prophase
Plant cell
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Prophase
Animal cell
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Metaphase
Description:

The chromosomes line up across the
center of the cell.

Each chromosome is connected to a
spindle fiber at its centromere.
Metaphase checkpoint ensures
that all of the chromosomes are
attached to the mitotic spindle by
a kinetochore .
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Metaphase
Plant cell
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Metaphase
Animal cell
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Anaphase
Description:
 The sister chromatids separate into
individual chromosomes and are
moved apart.

A cell plate forms in plant cells.
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Anaphase
Plant cell
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Anaphase
Animal cell
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Telophase
Description:

Nuclear envelope forms around each
new set of chromosomes

Spindle breaks down

Chromosomes uncoil

A cell wall begins to form
in plant cells.
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Telophase
Plant cell
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Telophase
Animal cell
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Cytokinesis
Description:
 Cytoplasm
pinches in
half.
 Daughter
cells have
an identical set of
duplicate
chromosomes.
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Cytokinesis
Plant cell
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Cytokinesis
Animal cell
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Phase Identification
Look at the onion root tip cells in your booklet and see
how many cells you can find in each stage.
Chose a color for each stage and outline the cell in that
color.
Cell Division
Color Key
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
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G0 (G zero)

If the cell does not receive a signal to
“go ahead” at the G1 checkpoint it will
not go into the dividing phases (Mitosis)

The cell is now said to be in G0

Most cells in your body are in this
stage.
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G0 (G zero)

Examples of cells in G0
– Nerve cells
– muscle cells
– Liver cells (although these cells can be
“called back” into the dividing phases of
mitosis based on external cues such as
growth factors)
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Cancer



Cancer is a disorder in which some of the
body’s own cells lose the ability to control
growth.
Cancer cells do not respond to the signals
that regulate the growth of most cells (G1
checkpoint is bypassed).
As a result, they divide uncontrollably and
form masses of cells called tumors that can
damage the surrounding tissues.
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Cancer Cause/Effect
What causes the loss of growth control that causes cancer??
Use the Cancer Cause/Effect powerpoint to fill in this map.
Fill in the various causes of cancer.
Fill in the effects for each cause.
C
A
N
C
E
R
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Videos

Cell Cycle

http://www.youtube.com/watch?v=NR0mdDJMHIQ

Cancer

http://www.youtube.com/watch?v=acUl9JC70e8
http://www.youtube.com/watch?v=IeUANxFVXKc

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