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5 marksGenetic Concepts

CSEC Biology · May/June 2021 · Paper 2 · Question 5(c)

The ABO blood grouping system is determined by antigens on the surface of red blood cells. An individual with one parent with heterozygous blood group A and the other parent with heterozygous blood group B may have a different blood group from either parent.

With the aid of a genetic diagram, explain how an individual may have a blood type that is different from either parent.

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Other parts of this question

  1. 5(a)Use clearly labelled diagrams to illustrate the structure of a red blood cell and the structure of a white blood cell.[6 marks]
  2. 5(b)Explain how any two features of a red blood cell ensure that it is suitable for its major function in the human body.[4 marks]

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