Question

Following table shows ABO blood group in man. Observe carefully and identify 'P', 'Q' and ' R '.

• A. \(\mathrm{P}-\mathrm{I}^{\mathrm{A}}\mathrm{I}^{\mathrm{A}}, \mathrm{Q}-\mathrm{AB}, \mathrm{R}-\) antibody a
• B. \(\mathrm{P}-\mathrm{I}^{\mathrm{A}}\mathrm{I}^{\mathrm{B}}, \mathrm{Q}-\mathrm{NIL}, \mathrm{R}-\) antibody b
• C. \(\mathrm{P}-\mathrm{I}^{\mathrm{B}}\mathrm{I}^{\mathrm{B}}, \mathrm{Q}-\mathrm{B}, \mathrm{R}-\mathrm{NIL}\)
• D. \(\mathrm{P}-\mathrm{I}^{\mathrm{O}}\mathrm{I}^{\mathrm{A}}, \mathrm{Q}-\mathrm{A}, \mathrm{R}-\) antibody ab

Hint:

Use the genotypes, antigens and antibodies in the ABO table.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
In ABO grouping, antibodies present are against the antigens absent from the RBCs.

Step 2: Find P
P has antigens A and B, so the genotype is \(\text{I}^{A}\text{I}^{B}\).

Step 3: Find Q
\(\text{I}^{O}\text{I}^{O}\) has no antigen on RBC, so Q is NIL.

Step 4: Find R
\(\text{I}^{A}\text{I}^{O}\) has antigen A, so the serum has antibody b.

Final Answer:
P is IAIB, Q is NIL and R is antibody b. \[ \boxed{\text{(B) }\text{P - I}^{A}\text{I}^{B}\text{, Q - NIL, R - antibody b}} \]