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5 marksGenetic Concepts

CSEC Biology · January 2016 · Paper 2 · Question 5(b)(ii)

Sickle-cell anaemia is an inherited condition in which the blood of affected persons cannot transport oxygen efficiently.

Fazul and Shanna both carry the sickle-cell trait. What is the chance that a child born to them would suffer from sickle-cell anaemia? Explain your answer with the aid of a genetic diagram. Use the following symbols: A – normal; S – sickle-cell.

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Other parts of this question

  1. 5(a)Name FOUR major components that make up human blood, and explain how the oxygen transported by the blood becomes available to cells for the production of…[8 marks]
  2. 5(b)(i)Describe TWO symptoms of sickle-cell anaemia.[2 marks]

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