Question

In blood group typing in human, if an allele contributed by one parent is $I^{4}$ and an allele contributed by the other parent is $i$ , the resulting blood group of the offspring will be

• A. A
• B. B
• C. AB
• D. 0

Answer 1

Answer: (A)

A

Answer 2

The blood group type in human provides an example of multiple allelism (ie, presence of more than two allele for one gene).
There are three A, B and 0 blood groups allele usually given the symbol $I^{A}, I^{B}$, and $I^{i} . I^{A}$ and $I^{B}$ are codominant to each other but both are dominant to $I^{i}$.
The offspring of parents having $I^{A}$ and $I^{i}$ allele will be $I^{A} I^{i}$ having blood group A.
$A-I^{A} I^{i} B-I^{B} I^{i} A B-I^{A} I^{B}$ $O-I^{i} I^{i}$