Question

A child with O blood group cannot have parents with the genotype

• A. $I^O{I}^O$
• B. $I^B{I}^O$
• C. $I^A{I}^O$
• D. $I^A{I}^A$

Answer 1

Answer: (D)

Genotype	Blood Type
OO	O blood type
AO or AA	A blood type
AB	AB blood type
BO or BB	B blood type

The ABO blood type chart can be used to predict the possibilities of paternity. The O- type antigen is masked by the presence of an A or B- type antigen.
For example, two O blood type parents can produce a child with only O blood type.
If the child has O blood type, then either one parent need to have O blood type. In the given option, IA IA will have a child with A blood type.
Thus, the correct answer is the option (B).