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If two parents who's blood types are both B produce a child that has blood type O, what can you say about the parent's genotypes?

Aone is ii
Bone is IBi
Cboth are IBi
Dnothing, this is impossible

Verified Answer :

Our blood groups are composed of two "letters", one from both parets.

People with Blood group B can have the type BB or B0 (IBi).

if they both have a blood group B0 (that is IBi) they can both give their children the "0" part of their blood group, and the child will have a 0 blood group.

The answer is

c. both are IBi (that is both are B0).

I believe the answer is C