What is Rh factor or Rh antigen?

Explanation

(i) Rh factor is a immunogenic D antigen of the Rh blood group system found on the surface of the erythrocytes of Rhesus monkey and human beings. In the blood it is inherited as a dominant trait.
(ii) An individual having D antigen are Rh D `(Rh^(+))` and those without D antigen are Rh D negative `(Rh^(-))`.