Bombay Blood Group Genes

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The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Bombay Blood Group Genes

As mentioned previously, the A and B genes cannot act directly on the precursor substance. Thus, since individuals with the Bombay phenotype have only the precursor substance and no H antigen, they cannot have A or B antigens, even if they have the A and/or B gene.