Principle of Inheritance and VariationMediumBloom L3

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?

Options

A.Type B
B.Type AB
C.Type O
D.Type A

Solution

Sol.(c) [Key Concept: Universal Blood Donor — Blood Group O] Type O blood group is the UNIVERSAL DONOR blood group. Type O red blood cells lack both A and B antigens on their surface, so they can be transfused to patients of any blood type (A, B, AB, or O) without triggering a major immune reaction. This makes Type O essential in emergency transfusions when the recipient's blood type is unknown. (Note: strictly, O-negative blood is the truly universal donor.)

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