The blood grouping system is an example of ‘multiple allelism’. In order to find out
the gene products of various gene variants, different enzymes (codes used for the purpose
of experimentation are X and Y) from four blood samples were assayed. The enzymes were
quantified and the information obtained from these experiments is given in percentages in
the following table. ‘+’ indicates presence of an enzyme and ‘-’ indicates the absence of
that enzyme from the blood sample. The standard codes for dominant and recessive alleles
are considered. Identify the blood groups of subjects and choose the correct option of their
genotypes from given options. (In table: P means present, A means absent)