passwella.
Menu

WAEC Biology 2018 Question 38

Question 38

Transport in Animals

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 transfused with blood of genotype

  1. A.OO.
  2. B.AO.
  3. C.BO.
  4. D.AA.
Show the answer and explanation

Answer: C (BO.)

Explanation

Patient X is group A and has anti-B antibodies, so X reacted to blood carrying the B antigen. Patient Y is AB and accepts any group. A donor of genotype BO (group B) explains both results.