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Boy
Name
Date
Class
CHAPTER 9
S My Guide
Section 3: Cell Cycle Regulation
Key
In your textbook, read about the abnormal cell cycle and cancer.
Complete the graphic organizer about the causes and prevention of cancer. These terms may be
used more than once: carcinogens, cell cycle, cells, DNA damage, genetic changes, spindle
fiber failure, the Sun's ultraviolet rays, tobacco.
Cancer
is the uncontrolled
growth and division of
Cells
that is often prevented by
Eyes
that is caused by
cell-cycle checkpoints
unrepaired exposure to
2.
that monitor for
Cechetic
3.
or
4.
Chang
5.
NA damage
Spridte Fiber
Carcinoscas
failure
such as
and stop the
6.
Genetic Changes
Cellcycle
7.
8.
Sun UV Rays
tobaccco
before
excessive X rays
cytokinesis
Complete the table by checking the correct column for each description.
Description
Apoptosis
Stem Cells
9. After a sperm fertilizes an egg, the resulting mass of cells divides until there
are about 100 to 150 cells.
10
Some cells go through a programmed death.
mbryonic cells shrivel and die, resulting in the formation of fingers and toes.
12. Unspecialized cells are either embryonic or adult.
13. This event occurs in cells that are damaged beyond repair.
128 Cellular Reproduction CHAPTER 9
Unit 2
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