This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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The question asks to identify the universal blood donor. Step 1: Understand the concept of a universal blood donor. A universal blood donor is a person whose blood can be transfused to almost any recipient, regardless of the recipient's blood type, without causing a severe immune reaction. This is because their red blood cells lack specific antigens (A, B, and Rh factor) that would trigger an immune response in the recipient. Step 2: Evaluate the given options. • A. AB: Individuals with AB blood type have both A and B antigens on their red blood cells. They are considered universal recipients because they can receive blood from all other blood types, but they are not universal donors. • B. O-: Individuals with O- blood type have neither A nor B antigens, and they also lack the Rh factor. This means their red blood cells do not carry any common antigens that would cause an immune reaction, making them the universal donor. • C. O+: Individuals with O+ blood type lack A and B antigens but possess the Rh factor. While O+ blood can be given to all Rh-positive blood types, it cannot be given to Rh-negative individuals, so it is not a truly universal donor. Step 3: Conclude the correct option. Based on the presence or absence of A, B, and Rh antigens, blood group O- is the universal donor. The final answer is B. O- Send me the next one 📸