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JAMB Biology 2002 Question 50

Question 50

Mendelian Inheritance

What proportion of the offspring of a cross between two heterozygous parents will exhibit the recessive condition phenotypically

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

Answer: A (1/4)

Explanation

Aa × Aa gives AA, Aa, Aa and aa. Only aa (1 in 4) shows the recessive trait.