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WAEC Biology 2002 Question 56

Question 56

Mendelian Inheritance

A man with heterozygous genotype for blood group B marries a woman with heterozygous A, what percentage (%) of their children would be universal donor?

  1. A.50%
  2. B.25%
  3. C.15%
  4. D.10%.
Show the answer and explanation

Answer: B (25%)

Explanation

Cross BO × AO gives AB, AO, BO and OO in equal numbers. Only OO (group O, the universal donor) is 1 in 4, which is 25%.