b1.7 genetic variation and its control gcse items that can be used to define successful outcomes for...

B1.7 Genetic variation and its controlGCSE items that can be used to define successful outcomes for peer and self assessment activities

Using Exam pro items to support successful outcomes

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Learners will be able to test their progress against learning outcomes using questions taken from past AQA GCSE examinations.

• Assessment of practical work

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The drawing shows a potato plant producing new tubers (potatoes). Buds on the stem of the parent plant produce stolons. The new tubers are formed at the ends of the stolons (stems that grow downwards).

(a)Explain why the new tubers are genetically identical to each other.

(2 marks)(b) Some of the tubers are used to produce potato plants. These new potato plants will not all grow to the same height

Give one reason why.(1 mark)

• B1.7 Genetic variation and its control June 2012

Mark scheme

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(a) grow from parents, by vegetative reproduction/asexual reproduction/

no sexual reproduction for 1 mark each(2 marks)

(b) e.g. different environmental conditions/named conditionor 1 mark

(1 mark)

• B1.7 Genetic variation and its control June 2012

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The photograph shows some cells in the root of an onion plant.

• B1.7 Genetic variation and its control June 2012 BL2HP

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(a) Cells X and Y have just been produced by cell division.4 (a) (i) Name the type of cell division that produced cells X and Y....................................................................................................................(1 mark)

4 (a) (ii) What happens to the genetic material before the cell divides?...............................................................................................................(1 mark)

4 (b) A gardener wanted to produce a new variety of onion.Explain why sexual reproduction could produce a new variety of onion....................................................................................................................

.........................(3 marks)

• B1.7 Genetic variation and its control June 2012 BL2HP

Mark scheme

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• B1.7 Genetic variation and its control June 2012 Mark Scheme

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Exampro Q08W.1H.08

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(a) (i) The herbicide-resistance gene is obtained from a herbicide-resistant plant.

Which structure in a cell carries the genes?

..................................................................................................

.....................(1 mark)

(ii) How is the herbicide-resistance gene cut out of this structure?

..................................................................................................

.....................

..................................................................................................

.....................(1 mark)

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(c) Suggest one advantage to a farmer of growing herbicide-resistant crops.

..............................................................................................

.........................

..............................................................................................

......................... (1 mark)

(d) Many people are opposed to the growing of herbicide-resistant crops produced in this way.Suggest one reason why.

..............................................................................................

.........................

..............................................................................................

......................... (1 mark)

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The photograph shows a zorse.A zorse is a cross between a male zebra and a female

horse.

The zorse has characteristics of both parents.

• B1.7 Genetic variation and its control June 2012 BL1FP

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(a) The zorse was produced by sexual reproduction

(a) (i) What is sexual reproduction?

.......................................................................................

(1 mark)

(a) (ii) The zorse has characteristics of a zebra and a horse.

........................................................................................

(2 marks)

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(b) Zorses are not able to breed.Scientists could produce more zorses from this zorse by adult cell cloning.The diagram shows how the scientists might clone a zorse.

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In this question you will be assessed on using good English, organisinginformation clearly and using specialist terms where appropriate.

Use information from the diagram and your own knowledge to describe how adult cell cloning could be used to clone a zorse.

............................................................................................................................

(6 marks)

Mark scheme

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B1.7 Genetic variation and its control June 2012 Mark Scheme

Version 2.0

• B1.7 Genetic variation and its control June 2012 Mark Scheme

b1.7 genetic variation and its control gcse items that can be used to define successful outcomes for...

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