Blood group system

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Possible Answers: ABO.

Random information on the term “ABO”:

Cis AB is a rare ABO Blood group antigen genotype which is phenotypically almost the same as AB. In Cis AB inheritance A and B antigen seem to be segregating as if they are in very close loci on the same chromosome. These can happen due to mutant alleles at ABO locus (multiple variants are available). Usually it is a single allele making a single enzyme which can make both A and B antigens.[1] Antigen expression is weaker than A1 or B.
Taken from Wikipedia