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JAMB Biology 1986 Question 38

Question 38

Mendelian Inheritance

If a woman who is a carrier of sickle cell trait (AS) married a man who is a sickler (SS) and they had four children, how many of them would be normal?

  1. A.Three
  2. B.Two
  3. C.One
  4. D.None.
Show the answer and explanation

Answer: B (Two)

Explanation

AS × SS gives AS and SS in equal numbers. Of four children, about two would be AS carriers, who are healthy (normal), and two would be sicklers.