Final answer:
The universal donor blood type is O negative, as it does not prompt an immune response in recipients of any ABO blood type.
Step-by-step explanation:
The universal donor blood type is O negative (O-). This is because type O negative blood does not have any A or B antigens on red blood cells, which means it can be given to people with any ABO blood type without causing an immune response. People with blood type O negative can donate to individuals of any other blood type, but they can only receive blood from other O negative donors. On the other hand, people with blood type AB positive (AB+) are considered universal recipients because they have both A and B antigens on their erythrocytes and do not produce anti-A or anti-B antibodies, allowing them to receive blood from any blood type. However, they can donate only to type AB individuals.
The universal donor blood type is O- (O negative).
Type O blood does not have the A or B antigens on the red blood cells, which means it can be transfused to anyone regardless of their blood type. It is considered the universal donor because it does not elicit an immune response when injected into a person of any blood type.
On the other hand, type AB blood is considered the universal acceptor because it has both A and B antigens and does not have anti-A or anti-B antibodies circulating in the blood plasma.