Question

In blood group typing in human, if an allele contributed by one parent is $I^A$ 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. $O$

Answer 1

Answer: (A)

$A$

Blood grouping is an example of multiple alleles and codominance in which more than one allele give single trait such as I${}^A$, I${}^B$, I${}^O$ and i. If an allele of one parent is I${}^A$ and others is i then the offspring will have blood group A because both the allele express itself completely, where I${}^A$ express enzyme for A and i express inactive enzyme.