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JAMB Biology 1987 Question 43

Question 43

Mendelian Inheritance

The ratio of carriers to sicklers in the F1 generation derived from a parental cross of two carriers of haemoglobin S gene is

  1. A.3:1
  2. B.1:3
  3. C.2:1
  4. D.1:2.
Show the answer and explanation

Answer: C (2:1)

Explanation

AS × AS gives 1 AA : 2 AS : 1 SS. Carriers (AS) to sicklers (SS) is therefore 2:1.