WAEC Biology 2018 Objective — Question 38
Question 38 of 50 from the West African Examinations Council (WAEC) Biology 2018 Objective paper, with the correct answer and a full explanation.
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Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with blood from the same donor. Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction. Patients X and Y were likely transferred with blood of genotype
- A. OO
- B. AO
- C. BOCorrect
- D. AA
Explanation
Patient X (genotype AO, blood group A) reacted badly, meaning the donor blood contained an antigen X's plasma has antibodies against (anti-B) — consistent with the donor blood being group B (genotype BO), which patient Y (group AB) could safely receive.
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