Question

if you are blood type a or type ab, your cells have type a antigens attached, so your body makes antibodies against only type b. once the type a antigens are kept at bay, your blood cells “show” type b as the dominant type. you can receive type b or type o blood, and you can donate to those with type b or type ab blood.
if you are blood type ab, your cells do not make antibodies against type a or type b surface antigens. therefore, you can receive blood from a donor with any blood type (universal recipient), but you can donate blood only to other people with type ab blood.
if you are blood type o, your cells make antibodies against both type a and type b antigens. this means that if you need blood, you can only receive more type o blood. but, you can donate your blood to anybody; thus, you are a universal donor. type o blood is the most common.

1. why is ab blood unique?
2. how is o blood unique?

Explanation:

1. AB blood is unique because its cells have both A and B antigens, so it can receive blood from all types (A, B, AB, O) as it does not make antibodies against A or B antigens.
2. O blood is unique as it is the universal donor. People with type O blood can donate to anyone because their blood cells have no A or B antigens. But they can only receive type O blood as their bodies make antibodies against both type A and type B antigens.

Answer:

1. AB blood is unique because its cells have both A and B antigens and can receive blood from all types.
2. O blood is unique as it is the universal donor and can be donated to anyone but can only receive type O blood itself.