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A series of processes that takes place in a
cell between one cell division and the next
4 main stages of the cell cycle:
1
...
2
...
Final growth and preparations
for cell division
4
...
I
P
M
A
T
• Nuclear membrane
is intact
• Chromosomes are
visible as long,
tangled threads
called chromatin
material/network
• DNA replication
occurs
• Chromatin network
condenses until individual
chromosomes become
visible
• Nuclear membrane starts
to disappear
• Centrioles start to
migrate/move to opposite
poles of the cell
• Spindle fibres start to form
between the centrioles
...
• The spindle fibres break down
...
• TWO IDENTICAL daughter cells
are formed
...
Cells divide so that organisms can GROW (growth = increase in number of cells as well as size of cells)
...
Cells also divide when new body tissues grow after damage to cells
...
3
...
Causes of cancer:
• An agent that causes cancer is
known as a carcinogen or
carcinogenic agent
• Carcinogen e
...
Benign – does not penetrate the tissues and is
usually enclosed in a capsule
2
...
When cells are spread by circulation of the
blood, new tumours form in other parts of the
body
...