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2 marksGenetic Variation and Speciation

CSEC Biology · May/June 2021 · Paper 2 · Question 6(d)(ii)

One biologist suggested that iguanas with longer tails were a new species, but another argued physical differences alone do not define a species. It was later concluded they were not a new species.

Provide an explanation to support the conclusion that the iguanas with longer tails were not a new species.

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Other parts of this question

  1. 6(a)Outline Darwin's theory of natural selection.[2 marks]
  2. 6(b)Explain why the development of antibiotic resistance by bacteria is considered to be an example of natural selection.[2 marks]
  3. 6(c)A farmer wishes to use artificial selection to alter the characteristics of his crops. Suggest two ways in which artificial selection will benefit the farmer.[2 marks]
  4. 6(d)(i)Suggest three possible reasons for the increase in tail length observed in these iguanas.[3 marks]
  5. 6(e)Describe two situations which may lead to the evolution of a new species.[4 marks]

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