Blood Type A Positive vs. AA Genotype: Understanding the Difference
A positive (A+) is a phenotype (blood group): A antigen on RBCs + Rh(D) antigen present.
AA is a genotype at the ABO locus: two A alleles (IAIA). An AA individual expresses the A antigen (phenotype A). They could be Rh+ or Rh−.
Key Distinctions
| Term | Level | Meaning |
|---|---|---|
| A positive | Phenotype | A antigen + Rh(D) positive |
| AA | Genotype | Two A alleles (homozygous A) |
| AB | Phenotype | Both A and B antigens (genotype AB) |
The original statement "AA has both A and B antigens" is incorrect. Only AB phenotype expresses both. AA expresses only A.
Clinical Relevance
- Phenotype determines transfusion compatibility.
- Genotype predicts inheritance patterns.
- Rh status is independent of ABO genotype.
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