If a person has the genotype Dce/dce, how is this individual classified?

If a person has the genotype Dce/dce, how is this individual classified?

• A. Rh positive
• B. Rh negative
• C. Rhnull
• D. Total Rh

Answer: (A)

An individual with the genotype Dce/dce is classified as Rh positive. The Rh blood group system is primarily determined by the presence or absence of the D antigen on the surface of red blood cells. In this scenario, the allele "D" indicates the presence of the D antigen, which is the primary factor for determining Rh positivity. Since the individual carries at least one dominant D allele (Dce), they will express the D antigen on their red blood cells and be classified as Rh positive. The "dce" allele does not produce D antigens and does not negate the presence of the D antigen from the "D" allele. Rh negative individuals would have two recessive alleles of "d", meaning their genotype would lack any D alleles, leading to an absence of the D antigen. Rhnull status refers to the complete lack of all Rh antigens, which is not the case here, as the individual shows the presence of the D antigen from the "D" allele. "Total Rh" is not a standard classification within the Rh blood group system and doesn't represent an established blood group category. Therefore, the classification of this individual as Rh positive is based on the presence of the dominant D allele in their genotype.

An individual with the genotype Dce/dce is classified as Rh positive. The Rh blood group system is primarily determined by the presence or absence of the D antigen on the surface of red blood cells. In this scenario, the allele "D" indicates the presence of the D antigen, which is the primary factor for determining Rh positivity.

Since the individual carries at least one dominant D allele (Dce), they will express the D antigen on their red blood cells and be classified as Rh positive. The "dce" allele does not produce D antigens and does not negate the presence of the D antigen from the "D" allele.

Rh negative individuals would have two recessive alleles of "d", meaning their genotype would lack any D alleles, leading to an absence of the D antigen. Rhnull status refers to the complete lack of all Rh antigens, which is not the case here, as the individual shows the presence of the D antigen from the "D" allele. "Total Rh" is not a standard classification within the Rh blood group system and doesn't represent an established blood group category.

Therefore, the classification of this individual as Rh positive is based on the presence of the dominant D allele in their genotype.