As per ABO blood grouping system, the blood group of father is $B^{+}$, mother is $A^{+}$and child i

Question

As per ABO blood grouping system, the blood group of father is $B^{+}$, mother is $A^{+}$and child is $O^{+}$. Their respective genotype can be

Choose the most appropriate answer from the options given below :

Accepted Answer

Sol. [Key Concept: ABO blood group inheritance]For an O group child (ii), each parent must contribute an i allele. Therefore the B group father must be Iᴮi and the A group mother must be Iᴬi. Their offspring can be IᴬIᴮ, Iᴮi, Iᴬi or ii. Only set A fits the stated parental and child ABO groups, so option (3) is correct. Rh positivity is inherited separately and does not alter this ABO deduction.

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