Transcript Mitosis and Cancer - HRSBSTAFF Home Page

Mitosis and Cancer
The Cell Cycle
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Under normal conditions instructions in a
cell’s DNA control its rate of cell division.
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Suicidal Tendencies: A cell may destroy
itself it something has gone wrong or if the
genetic information is damaged.
Cell Cycle Gone Wild!
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When cells begin to divide uncontrollably
the result is cancer.
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Cancerous cells interfere with surrounding
cells and disrupt the normal functioning.
Mitosis Mishap
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Cancer cells continue to divide indefinitely.
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They are stuck in the mitosis part of the cell cycle;
always dividing without replicating and preparing
the cells DNA.
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The result is more and more cells with altered
DNA that are no longer able to function properly.
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Brain Pop: Cancer
http://www.brainpop.com/health/diseasesinj
uriesandconditions/cancer/
Why is Cancer Dangerous?
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In some cases the excess cells can form a lump,
or tumour.
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In other cases the cells travel to other areas of the
organism.
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These cells gobble up oxygen and nutrients and
crowd out normal functioning cells robbing them
of food.
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All cancers are caused by mutations in the
genes that control cell division.
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A carcinogen is any substance or energy
that causes such a mutation.
Mitosis Questions:
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Page 23 in your text book.
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Complete questions 1, 2, 4, 6
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Complete in full sentences and pass them
in.