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2 marksGenetic Variation and Speciation

CSEC Biology · May/June 2017 · Paper 2 · Question 2(c)(ii)

Some lizards were washed away on a log during a hurricane and landed on a remote island. Several years later, they were classified as a new species.

The new species of lizards living in the mountainous region of the island were found to be smaller than those living on the lowlands. Suggest TWO reasons for this variation.

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Other parts of this question

  1. 2(a)Complete the classification by writing the correct answers at (i), (ii), (iii), (iv) and (v) in Figure 3.[5 marks]
  2. 2(b)(i)Define the term 'species'.[2 marks]
  3. 2(b)(ii)Using the human species as an example, explain why physical appearance or morphology is NOT always useful for identifying organisms belonging to the same…[2 marks]
  4. 2(b)(iii)Suggest ONE reason why biologists use the biological concept of species instead of physical characteristics to classify organisms.[2 marks]
  5. 2(c)(i)Using the biological concept of a species, state TWO reasons why they were reclassified.[2 marks]

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