question_answer

If a child is of O blood group and his father is of B blood group, the genotype of father is

A)  \[{{\text{I}}^{\text{o}}}\,{{\text{I}}^{\text{o}}}\]                                           

B)  \[{{\text{I}}^{A}}\,{{\text{I}}^{B}}\]

C)  \[{{\text{I}}^{o}}\,{{\text{I}}^{B}}\]                                       

D)  \[{{\text{I}}^{o}}\,{{\text{I}}^{A}}\]

Correct Answer: C

Solution :

                 Genotype of a person with blood group 'B' may  be \[{{\text{I}}^{\text{B}}}{{\text{I}}^{\text{B}}}\] or \[{{\text{I}}^{\text{o}}}{{\text{I}}^{\text{B}}}\], person with genotype \[{{\text{I}}^{\text{B}}}{{\text{I}}^{\text{B}}}\] cannot produce off springs with blood group 'O' in any case but if the person's genotype is \[{{\text{I}}^{\text{o}}}{{\text{I}}^{\text{B}}}\], then its off springs may have blood group 'O'.  eg: