Download Mitosis

HB2.22.1
Lesson reference: B2.22 Cell division – mitosis
Mitosis
Learning objectives:
 Know that mitosis is a type of cell division in body cells producing two
genetically identical cells.
 Know that organisms that reproduce asexually use mitosis.
Suggested time:
30 minutes
Name: ________________________________ Date: _____________________
The diagrams A–F below show a cell dividing by mitosis.
A Arrange the letters of the diagrams to show how mitosis happens:
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B On the diagrams, label:
a chromosome
a chromatid (the duplicate of a chromosome)
a daughter cell
a nuclear membrane
a parent cell
C The sentences below relate to mitosis. Arrange them in the correct sequence.
1
2
3
4
5
6
The cell divides into two.
Two new nuclei form, each with a full set of chromosomes.
Each ‘double’ chromosome splits into its two identical copies.
The duplicated chromosomes line up across the centre of the cell.
Each cell is genetically identical to each other and to the parent cell.
Each copy moves to opposite poles (ends) of the cell.
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D Japanese knotweed is a plant that may cause great damage to an
environment. One was first introduced to the UK as an exotic garden plant
during the nineteenth century. It has since invaded the environment. It is a
problem because there are no natural pests of it here, to keep the growth ion
check. Its roots can grow down 3 metres and spread outwards 7 metres. It can
demolish walls and even some buildings. In the UK it does not reproduce by
flowers and seeds. It reproduces asexually. All the knotweed plants in the UK
are genetically identical to the first knotweed plant that was introduced.
i
What type of cell division does this plant use for reproduction?
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ii Explain why all the Japanese knotweed plants in the UK are genetically
identical to each other:
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Practical activities have been checked for health and safety advice by CLEAPSS.
All users will need to review the risk assessment information and may need to adapt it to local circumstances.
© Oxford University Press 2011
This document may have been altered from the original.
209
Practical activities have been checked for health and safety advice by CLEAPSS.
All users will need to review the risk assessment information and may need to adapt it to local circumstances.
© Oxford University Press 2011
This document may have been altered from the original.
210