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JAMB Biology 2003 Question 39

Question 39

Mendelian Inheritance

A man and his wife are both heterozygous for the sickle-cell trait. The likely percentage of their offspring that will be either carriers or 'sicklers' is

  1. A.75%
  2. B.50%
  3. C.25%
  4. D.100%.
Show the answer and explanation

Answer: A (75%)

Explanation

AS × AS gives AA, AS, AS and SS. Carriers (AS) and sicklers (SS) make 3 out of 4, which is 75%.