CSEC Biology · January 2009 · Paper 2 · Question 3(a)(iii)
What type of genetic variation is shown by the flower colour in Impatiens? Explain your answer.
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- 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]
- 3(a)(ii)If F₁ Impatiens plants were crossed, what would be the phenotypic ratio for flower colour in the offspring?[2 marks]
- 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]
- 3(b)(ii)If the Impatiens flowers in Figure 3 showed co-dominance, what would be the phenotype of the F₁ generation?[1 mark]
- 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…[4 marks]
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