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Cell division
SQA questions
What you should know
ncreasing
• Cell division is a means of i_________
the
ells in an organism
number of c____
ell a______,
ctivities
• Nucleus of the cell controls c___
ell
ivision
including c____
d_______
ach of the t___
wo cells produced by cell
• E___
division has a complete set of
hromosomes and the s_____
ame
c__________
information.
oss
enetic
This ensures there is no l____
of g______
nformation in the t___
wo new b____cells
ody
i________
two stages
• Cell division occurs in ____
ytoplasm
• Division of the c_________
and division of
itosis
the nucleus called m_______.
• Before the nucleus divides each
opied so there is a copy
chromosome is c_____
hromatid
ach of the
chromosome (c_________)
for e___
two new cells
• The copy chromosomes are held together
entromere
by a c__________
and are called
c__________
hromatids
chromatids
centromere
original
chromosome
copy
chromosomes
6
_______
3
_____chromosomes
in
ach n___
ew c____
ell and
e____
3 chromosomes were in
___
copy chromosomes the original p________
arent
(chromatids) b____cell
ody
4 copy chromosomes
_______
(chromatids)
2
_____chromosomes
in
ach n___
ew c____
ell and
e____
___
2 chromosomes were in
arent
the original p________
ody cell
b____
6 copy chromosomes
_______
(chromatids)
_____chromosomes
in
3
ew c____
e____
ach n___
ell and
___
3 chromosomes were in
arent
the original p________
ody
b______cell
8 copy chromosomes
_______
(chromatids)
4
_____chromosomes
in
ach n___
ew c____
ell and
e____
4 chromosomes were in
___
arent
the original p________
ody
b_____cell
What is the correct order?
X
W
Y
U
V
What is the correct order?
U
Y
W
V
X
What is the correct order?
B
D
A
E
C
What is the correct order?
C
B
A
D
E
1
Describe what is happening
Nuclear membrane disappears.
Chromosomes being copied
Draw or describe what happens next
Copy chromosomes (chromatids )
appear
What type of cell is this? Animal or
plant Animal
Describe what is happening
Cytoplasm dividing by tucking in.
Draw or describe what happens next
Two cells are formed
Describe what is happening
4
Copy chromosomes
(chromatids) have formed
Draw or describe what happens next
Copy chromosomes
(chromatids) line up at the
equator of the spindle
What type of cell is this? Animal or plant ?
Plant
Describe what is happening
New cell wall forms between the
two new cells
Describe what is happening
Copy chromosomes (chromatids) lined
up at the equator of the spindle
Draw or describe what happens next
Spindle separates the copy
chromosomes (chromatids)
Describe what is happening
The copy chromosomes (chromatids)are
being separated
Draw or describe what happens next
New nuclear membranes form
round copy chromosomes.
New cell wall forms
4
mitosis
Chromosomes (chromatids) are being
pulled apart to opposite ends of the cell
To make sure there is no loss of genetic
information (genes) in the new cells
mitosis
New cell wall developing
Division of cytoplasm
Chromosomes becoming visible
Nuclear membrane breaking down
To make sure there is no loss of genetic
information (genes) in the new cells