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4 marksBiological Evolution

CSEC Biology · May/June 2014 · Paper 2 · Question 5(c)

Many of the antibiotics used to control tuberculosis are no longer effective.

Use the theory of natural selection to account for this.

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Other parts of this question

  1. 5(a)Define the terms 'genotype', 'phenotype', 'recessive' and 'dominant'.[4 marks]
  2. 5(b)(i)Give TWO examples of traits that show continuous variation.[2 marks]
  3. 5(b)(ii)Using appropriate symbols, draw a genetics diagram to show the genotypes of the parents and the expected phenotypes of the offspring.[5 marks]

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