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4 marksGenetic Concepts

CSEC Biology · January 2009 · Paper 2 · Question 3(b)(iii)

In the space provided below, show, by using a genetic diagram, how a child may inherit blood type O from parents who belong to blood groups A and B respectively.

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  1. 3(a)(i)Complete the chart in Figure 3, using letters and words as appropriate, to show the inheritance of flower colour when two pure-breeding varieties of Impatiens…[3 marks]
  2. 3(a)(ii)If F₁ Impatiens plants were crossed, what would be the phenotypic ratio for flower colour in the offspring?[2 marks]
  3. 3(a)(iii)What type of genetic variation is shown by the flower colour in Impatiens? Explain your answer.[3 marks]
  4. 3(b)(i)The alleles of the ABO blood group in humans show co-dominance. How does this co-dominance differ from incomplete dominance shown in the inheritance of flower…[2 marks]
  5. 3(b)(ii)If the Impatiens flowers in Figure 3 showed co-dominance, what would be the phenotype of the F₁ generation?[1 mark]

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