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4 marksNatural Selection

CAPE Biology Unit 1 · 2011 · Paper 2 · Question 5(b)(ii)

The black billed seed-crackers that inhabit a rainforest in Cameroon, West Africa were found to have EITHER large or small bills, with no birds having bills of intermediate sizes.

Discuss how the frequency of the distribution of phenotypes in the example above would be different if the other two types of selection operated.

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Other parts of this question

  1. 5(a)(i)Outline the stages in Meiosis 1 and comment on the importance of this phase of meiosis.[6 marks]
  2. 5(a)(ii)State TWO ways in which daughter cells produced by meiosis differ from those resulting from mitosis.[2 marks]
  3. 5(b)(i)Which of the three types of natural selection BEST describes the example above? Justify your choice.[3 marks]

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