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 heterozygous condition. So if a child has a blood group $O$ he/she must have $I^{\circ} I^{\circ} & he$ /she cannot have the parents of blood group $A B & A B / O$.
