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8 marksNatural Selection

CAPE Biology Unit 1 · 2007 · Paper 2 · Question 9(c)(i)

Discuss EACH of the following terms: Include in your answer the effects of environmental pressure on ONE named example in each case to illustrate the operation of these two methods of natural selection.

Stabilizing selection

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Other parts of this question

  1. 9(a)(i)Define the term 'environment', and explain the influence of ONE physical factor and ONE biotic factor, on the environment.[6 marks]
  2. 9(a)(ii)Define the term 'evolution', and explain the difference between the terms 'allopatric' and 'sympatric'.[1 mark]
  3. 9(b)Give FOUR reasons for the importance of maintaining biodiversity on earth.[4 marks]
  4. 9(c)(ii)Directional selection[1 mark]
  5. 9(d)"Disruptive selection is closely associated with speciation." Comment on this statement.[2 marks]

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