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Use of Punnett squares

A and a type B male can have a child with type O blood

Yes it is possible for the two to give birth for a child with blood group O. Blood group A exists in two types. AA and AO. The same case applies to Blood group B. It can be BB or BO. For blood group A with genotypic composition AO, the child will have blood group O and for blood group B with genotypic composition of BO, the child will have blood group O. however, with genotypic composition of BB or AA, the child will blood group B, A or AB.

Let me determine the outcome of this using the punnett squares

Case one (blood group A)

A

O

A

AA

AO

O

AO

OO

Case two (blood group B)

B

O

B

BB

BO

O

BO

OO