AP BIOLOGY

Detailed explanation-1: -Although people with an O blood type are commonly known as universal blood donors, people with O-(negative) blood type are the true universal donors. It is because their red blood cells do not carry antigens. So, they can donate blood to any other blood group.

Detailed explanation-2: -Group O can donate red blood cells to anybody. It’s the universal donor. Group AB can donate to other AB’s but can receive from all others. Group B can donate red blood cells to B’s and AB’s.

Detailed explanation-3: -Pruthi, M.B.B.S. For emergency transfusions, blood group type O negative blood is the variety of blood that has the lowest risk of causing serious reactions for most people who receive it. Because of this, it’s sometimes called the universal blood donor type.

Detailed explanation-4: -Although the blood type O+ can donate blood to all positive blood types (A+, B+, AB+, and O+), it is not a universal donor. Blood type O-is the universal blood donor, meaning that people with this blood type can donate blood to all other types with a lower risk of causing serious reactions.

Detailed explanation-5: -Type O blood is called the universal donor because: It has neither A nor B surface antigens on the red blood cells. Antigens are proteins that are capable of evoking an allergic response in someone whose whole body does not have the antigens.