Blood Type O and Race: Debunking the "Mixed Ancestry" Myth

The claim that Black individuals with type O blood have white ancestry is scientifically false.

Genetics of ABO Blood Group

• Determined by ABO gene on chromosome 9.
• Three main alleles: I^A, I^B, i (O).
• Type O = ii genotype (no A or B antigens on RBCs).

Population Distribution

• Type O is the most common blood group globally (~63% overall).
• High frequencies in Indigenous Americas (~100%), Basques, and many African populations.
• Not a marker of recent admixture; reflects ancient evolutionary selection (e.g., malaria resistance).

Race vs. Genetics

Race is a social construct; genetic ancestry is complex. Blood type is a single-locus trait with no correlation to overall genomic ancestry. Using it to infer "racial purity" is pseudoscience.