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1 markGenetic Concepts

CSEC Biology · January 2019 · Paper 2 · Question 3(d)(ii)

A couple with blood groups A and B has a son with blood group O.

What is the genotype of the child with blood group O?

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Other parts of this question

  1. 3(a)(i)What is the effect on the expression of phenotype for continuous and discontinuous variation?[2 marks]
  2. 3(a)(ii)State how the data for continuous variation should be presented graphically.[1 mark]
  3. 3(b)(i)State ONE characteristic of human beings that shows continuous variation.[2 marks]
  4. 3(b)(ii)State ONE characteristic of human beings that shows discontinuous variation.[2 marks]
  5. 3(c)State TWO cellular components of blood.[2 marks]
  6. 3(d)(i)Complete the genetic diagram below to show how this is possible.[4 marks]
  7. 3(e)Suggest THREE events which take place during sexual reproduction which may have led to the variation in the height of the two sisters.[3 marks]

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