Question

Which of the following is true concerning the Rh blood group?

A. Presence or absence of Rh antigens is genetically determined
B. People with blood type B are really B negative
C. Being Rh- is associated with sickle-cell disease
D. Rh+ people can give blood to anyone

Answer 1

The Rh blood group is determined by the presence or absence of the Rh D antigen on erythrocytes. It is genetically determined and separate from the ABO blood types. Correct option is A.

Step-by-step explanation:

The Rh blood group is classified based on the presence or absence of a second erythrocyte antigen called Rh. People with the Rh D antigen present on their erythrocytes are Rh positive (Rh+) while those who lack it are Rh negative (Rh-). The Rh group is separate from the ABO group, so any individual, regardless of their ABO blood type, may have or lack the Rh antigen. The genetically determined ABO blood types are A, B, AB, or O, and the presence or absence of the Rh antigen is determined by the Rh factor.

A. Presence or absence of Rh antigens is genetically determined. The Rh blood group is determined by the presence or absence of the Rh D antigen on the erythrocytes. It is genetically determined and separate from the ABO blood types.