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JAMB Biology 2010 Question 47

Question 47

Mendelian Inheritance

If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is

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

Answer: B (1/4)

Explanation

Crossing Aa × Aa gives 1 AA : 2 Aa : 1 aa. Only the aa offspring shows the recessive trait, so the probability is 1/4.