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1 markEcological Systems, Biodiversity and Conservations

CAPE Biology Unit 2 · January 2022 · Paper 2 · Question 1(d)(i)

A biologist conducted an experiment in a garden near his home. The results revealed that there were moths of the same species which had different colour wings. He noted that the moths either had a wing colour similar to the colour of the tree bark (brown wings) or they had a different colour from the tree bark (white wings). He concluded that there was genetic variation in the wing colour of the moths in his area.

Suggest ONE way in which this genetic variation may have arisen in the moth population.

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Other parts of this question

  1. 1(a)On the grid provided on page 5, use appropriate scales and axes to draw a graph of the results obtained in Table 1. Provide an appropriate title for your graph…[5 marks]
  2. 1(b)State TWO precautions which should have been taken during this investigation.[2 marks]
  3. 1(c)(i)Define the following terms: Continuous variation; Discontinuous variation.[2 marks]
  4. 1(c)(ii)Suggest the type of variation which was investigated in this experiment.[1 mark]
  5. 1(c)(iii)Identify the type of graph that would be suitable for representing the data from the second experiment.[1 mark]
  6. 1(d)(ii)Suggest ONE reason why genetic variation would be important to the moths.[1 mark]
  7. 1(d)(iii)With the use of a genetic diagram, explain the results of a cross between a moth with brown wings and a moth with white wings that produces all offspring with…[6 marks]
  8. 1(d)(iv)Suggest the genotype of the parent with brown wings.[1 mark]
  9. 1(e)Suggest how the creation of the new type of diamond back moth differs from the formation of moths with a different wing colour.[2 marks]
  10. 1(f)(i)Name an appropriate device which can be used to capture the moth.[1 mark]
  11. 1(f)(ii)State how the moth is captured using the device named in (f) (i).[1 mark]
  12. 1(f)(iii)State ONE precaution that should be taken for the follow-up experiment in (f) (i).[1 mark]

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