According to the Wiener nomenclature, how many closely linked loci determine the Rh antigens?

According to the Wiener nomenclature, how many closely linked loci determine the Rh antigens?

• A. One complex locus
• B. Two separate loci
• C. Three closely linked loci
• D. Multiple loci with no clear linkage

Answer: (C)

The Wiener nomenclature for the Rh blood group system is based on the concept of multiple alleles at closely linked loci. In this system, the primary Rh antigens, such as D, C, c, E, and e, are determined by three closely linked loci, which contribute to the expression of the Rh antigens on the red blood cells. The three loci involved are responsible for the various antigens that make up the Rh system, with locus R1 leading to the production of D and C antigens, locus R2 leading to D and c antigens, and locus r producing e antigens. These loci are inherited together due to their close linkage on the chromosome, which means that they do not assort independently. This complex arrangement allows for intricate variations in Rh phenotypes among individuals and underscores the importance of genetic linkage in blood group inheritance. Understanding this concept is crucial for blood compatibility testing and managing transfusions, as discrepancies in Rh typing can lead to serious hemolytic reactions.

The Wiener nomenclature for the Rh blood group system is based on the concept of multiple alleles at closely linked loci. In this system, the primary Rh antigens, such as D, C, c, E, and e, are determined by three closely linked loci, which contribute to the expression of the Rh antigens on the red blood cells.

The three loci involved are responsible for the various antigens that make up the Rh system, with locus R1 leading to the production of D and C antigens, locus R2 leading to D and c antigens, and locus r producing e antigens. These loci are inherited together due to their close linkage on the chromosome, which means that they do not assort independently.

This complex arrangement allows for intricate variations in Rh phenotypes among individuals and underscores the importance of genetic linkage in blood group inheritance. Understanding this concept is crucial for blood compatibility testing and managing transfusions, as discrepancies in Rh typing can lead to serious hemolytic reactions.