JAMB Biology 2023 Objective — Question 15

Question 15 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2023 Objective paper, with the correct answer and a full explanation.

If a body has blood type O and his mother has blood type A, what is the likely genotype of his father?

A. AB
B. AOCorrect
C. BB
D. AA

Explanation

For a child to have blood type O, both parents must carry the recessive allele (genotype including O); given the mother is quoted as type A (which could be AA or AO), the father's genotype must be AO or BO (or O) to allow an O-type child - AO is the answer among the given options.

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