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2 marksGenetic Variation and Speciation

CSEC Biology · May/June 2006 · Paper 2 · Question 5(c)(ii)

'Monocropping' - planting of the same type of plants over an extensive area - is sometimes considered risky because of the lack of genetic variation.

Explain why this practice may be considered risky.

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Other parts of this question

  1. 5(a)(i)Parents (P₁) represent pure-breeding dogs for coat colour. In the space provided below, use appropriate symbols to represent the coat colour for both parents…[3 marks]
  2. 5(a)(ii)Using appropriate stripes, complete the diagrams of the F₂ generation in Figure 6, to show the coat colours of the offspring when the F₁ generation interbreed.[4 marks]
  3. 5(b)(i)Explain the meaning of the term 'phenotype'.[2 marks]
  4. 5(b)(ii)How is the phenotype of an organism determined?[2 marks]
  5. 5(c)(i)Why is genetic variation important?[2 marks]

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