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2 marksGenetic Variation and Speciation

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

Each kingdom is further subdivided into taxa with the lowest rank being the level of species.

Using the human species as an example, explain why physical appearance or morphology is NOT always useful for identifying organisms belonging to the same species.

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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)(iii)Suggest ONE reason why biologists use the biological concept of species instead of physical characteristics to classify organisms.[2 marks]
  4. 2(c)(i)Using the biological concept of a species, state TWO reasons why they were reclassified.[2 marks]
  5. 2(c)(ii)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…[2 marks]

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