Question

Match the following related to phenotypes and genotypes of blood groups
$\begin{array}{cccc}& Column-I& & Column-II\\ 1.& A& P.& \left(ii\right)\\ 2.& B& Q.& I^A{I}^A,I^{A}i\\ 3.& AB& R.& I^B{I}^B,I^{B}i\\ 4.& O& S.& I^A{I}^B\end{array}$

• A. 1 - P; 2 - Q; 3 - R; 4 - S
• B. 1 - Q; 2 - R; 3 - S; 4 - P
• C. 1 - S; 2 - R; 3 - Q; 4 - P
• D. 1 - P; 2 - R; 3 - P; 4 - S

Answer 1

The correct option is B

1 - Q; 2 - R; 3 - S; 4 - P

The ABO blood groups in a population is formed by two co-dominant alleles $\left(I^A\right)$ and $\left(I^B\right)$, and one recessive allele (i), also represented as $\left(I^O\right)$. Thus blood group A has two genotypes $\left(I^A{I}^{A}and{I}^{A}i\right)$ , Blood group-B has two genotypes $\left(I^B{I}^{B}and{I}^{B}i\right)$ , Blood group AB has one genotype $\left(I^A{I}^B\right)$ and Blood group O has the recessive genotype (ii).