The traits for blood type and rh are the result of the presence or absence of particular (proteins) or (enzymes) on the erythrocytes.

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The traits for blood type and Rh are the result of the presence or absence of proteins on the outside of erythrocytes, called surface antigens, being the antigens A and B, for the blood group, and the Rhesus factor for the Rh.

Explanation:

Blood group

The blood type or group is determined by the presence or absence of antigens A and B, which is determined by three genes A, B and O:

Rh factor

The Rh factor, which owes its name to the rhesus monkey study, is also a surface protein - the Rh antigen - that determines this characteristic in the blood.

The nomenclature used for this type of blood uses the signs "+" or "-" after the Type ABO, indicating the presence or absence of the Rh factor, respectively.

The importance of knowing the presence or absence of erythrocyte surface antigens is that it determines the compatibility of blood type, and the possibility of transfusions. The ORh- blood type is currently known to be a universal donor and AB+ is a recipient of any blood type.

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