Body Fluids and Circulation Question 34
34. A child of blood group $O$ cannot have parents of blood groups
(a) $AB$ and $AB / O$
(b) $A$ and $B$
(c) $B$ and $B$
(d) $O$ and $O$
Show Answer
Answer : a
Hints & Solutions
(a) The inheritance of blood group is determined by some allelic genes which are $I^{A}$, $I^{B}$ & $I^{\circ}$. In one individual, two allelic genes are present. $I^{A}$ & $I^{B}$ are dominant, while $I^{O}$ is recessive in the heterozygous condition. So, if a child has a blood group $O$, he/she must have $I^{\circ}I^{\circ}$ and he/she cannot have the parents of blood group $AB$ & $AB/O$.
