Suzanne has type a– blood. which blood type could she receive in a blood transfusion?
a+
o–
o+
b–

The correct answer would be O-

In humans, blood group is mainly determined by ABO and Rh factor.

Blood group A- indicates that Suzanne has antigen A on her red blood cell. In addition, Rh factor antigen is absent in her blood.

So, she can not accept blood which has antigen B and which Rh positive.

Thus, her body can accept blood with blood group A- or O-.  

Blood group O is a universal donor as it does not contain any antigen on red blood cells.

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