Final answer:
The Rh genotype refers to d. antigens detected on a red blood cell by serologic methods. The Rh blood group system is controlled by two genes on chromosome 1, with the D antigen being the most significant and clinically important. Rh positive (Rh+) individuals have the D antigen, while Rh negative (Rh-) individuals lack it.
Step-by-step explanation:
The Rh genotype refers to d. antigens detected on a red blood cell by serologic methods. The Rh blood group system is controlled by two genes on chromosome 1 that produce a variety of alleles and antigens. The most significant and clinically important Rh antigen is designated as D.
Individuals who have the D antigen are Rh positive (Rh+) and those who lack it are Rh negative (Rh-). This Rh group is distinct from the ABO blood group and can be designated by adding the word positive or negative to the ABO type, such as A positive or AB negative.