NEET 2011 Biology question
A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers blood donation without delay. What would have been the type of blood group of the donor friend.
Answer: (3)
Solution
When the recipient's blood group is unknown, the safest donor is one whose red cells carry neither A nor B antigen, i.e. group O (universal donor), since O red cells will not be
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