Meiosis_Long1

Set 1

Set 2

Set 3

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Set 2

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The diagrams below represent phases of meiosis.

Question 1

Name the process taking place at A. (1)

Crossing over

Identify structures B, C, D and E. (4)

B: Centromere

C: Nuclear membrane

D: Centrosome/centriole

E: Homologous chromosomes

State ONE function of F. (2)

Part F/Spindle threads contract to move chromosomes towards opposite poles.

Allow for the attachment of chromosomes.

(any 1)

What phase of meiosis is shown in diagram 2? (2)

Metaphase 1

Provide a reason for your answer to the above question. (2)

Chromosomes arranged along the equator in homologous pairs.

How many chromosomes are shown in diagram 3? (1)

Name ONE organ in the female body where the process of meiosis occurs. (1)

Ovary

The diagram below represents an animal cell in a phase of meiosis.

Question 2

State which phase of meiosis is represented in the diagram above. Give a reason for your answer. (3)

Anaphase II

Reason: Chromatids (daughter)/chromosomes are moved/pulled towards the poles.

Identify parts A and B. (2)

A: Spindle fibre

B: Cell membrane

How many chromosomes were present in the parent cell before it underwent meiosis? (1)

How many chromosomes will be present in each cell at the end of meiosis? (1)

Could the cell represented in the diagram be that of a human? Explain your answer. (3)

Humans would have 23 pairs chromosomes/46 chromosomes in this phase. This diagram shows only 4 chromosomes/8 chromatids / 8 daughter chromosomes incorrect number of chromosomes.

Give TWO reasons why meiosis is biologically important. (2)

Reduction/halving of chromosome number/ allows for creation of gametophyte/ keep chromosome number constant from generation to generation/prevents doubling of chromosome number at fertilisation.

Contributes to genetic variation.

Leads to the formation of gametes.

(Any 2)

The diagram below represents a process taking place during meiosis.

Question 3