Mitosis Question Booklet
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Unit 2- Woodford County High School
Question 1
Unit 2- Woodford County High School
Unit 2- Woodford County High School
Unit 2- Woodford County High School
Question 2
The diagram below shows the structure of a chromosome as it might appear at the end of
prophase of mitosis.
A
B
(a) Name the parts labelled A and B.
A .................................................................................................................................
B .................................................................................................................................
(2)
Unit 2- Woodford County High School
(b) During metaphase of mitosis, the chromosomes become attached to the equator of
the spindle. Name the stage of mitosis that follows metaphase and describe the
events that occur in this stage.
Stage ...........................................................................................................................
Events occurring ........................................................................................................
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(3
(c)
Explain the significance of the stage you have named and described in (b).
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(1)
(d) Mitosis forms part of the cell cycle. Name one other stage of the cell cycle and
state what occurs in the stage that you have named.
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....................................................................................................................................
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(2)
(Total 8 marks)
Unit 2- Woodford County High School
Question 3
An investigation was performed to determine the length of time that a cell in an onion
root tip spends in each stage of mitosis.
A growing root from an onion was selected and a root tip squash was made. This was
examined under a light microscope and the percentage of cells in each stage of mitosis
was determined.
The results are shown in the table below.
Stage of mitosis
Percentage of cells in this
stage
Prophase
2.43
Metaphase
1.40
Anaphase
0.70
Telophase
2.78
(a) Describe how you would prepare a root tip squash so that mitosis could be studied.
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(4)
Unit 2- Woodford County High School
Mark Scheme
Question 1
Question 2
(a)
A - chromatid;
B- centromere;
(b)
2
Anaphase;
Chromatids separate / centromere splits
Move / pulled to (opposite) poles / ends of cell / ends of spindle to centrioles ;
(c)
By spindle fibres / microtubules
3
Daughter cells genetically identical (to parent cell) /maintains
chromosome number/eq;
1
(d) Interphase / G1 / S / G2 / cytokinesis / cleavage
If interphase or named stage - growth/synthesis of organelles
Unit 2- Woodford County High School
synthesis / replication of DNA / division of organelles
OR
If cytokinesis - division of the cytoplasm / formation of cell plate in plants ;
Points linked. [if give ‘telophase’and then describe division of
cytoplasm allow second mark]
2
[8]
Question 3
(a) 1.
Reference to named stain (acetic orcein / acetocarmine /
Feulgens / Schiffs);
2.
{Warm / heat} (with the stain / acid);
3.
Break open tip (with needle / eq);
4.
{Mount / eq} in {stain / acid / water / glycerol};
5.
(Gently) squash under coverslip / eq;
6.
Warm (gently to intensify stain);
4
(b) 1.
Telophase is the longest stage;
2.
Anaphase is the shortest stage;
3.
Correct manipulation of figures to compare any two phases;
4.
Any two actual times given e.g. {prophase 29.16 mins /
metaphase 16.80 mins / anaphase 8.40 mins / telophase 33.36 mins};
3
(c) (Use the equation to) work out actual time of each phase;
Total all four times;
OR
Add up all 4 percentages;
{Substitute into equation / eq} / Multiply by
1200
;
100
2
[9]
Unit 2- Woodford County High School