Question

A boy has the blood group 0. What is true of the inheritance of this blood group in his case?

• A. His mother should be with AB blood group
• B. Both his parents could be heterozygous A group
• C. His father could be homozygous B group
• D. His mother could be homozygous A group

Answer 1

The correct option is B Both his parents could be heterozygous A group

If the boy has blood group o, both his parents could probably be heterozygous A group, $I^A{I}^O$, in both the parents.

So, the correct option is 'Both his parents could be heterozygous A group'.