Question

If mother has only 'B' antibody and blood group of father is 'O' then the blood group of child may be

• A. A and B
• B. AB
• C. A and O
• D. O

Answer 1

The correct option is C A and O

A person with “A” blood group carries “A” antigen on their RBCs and anti-B antibodies in their serum; so, the mother has "A" blood group while the father has "O" blood group. A couple with A ($I^A$$I^A$ or$I^A$i) and O blood group can have children with A ($I^A$$I^A$ or$I^A$i) or O blood group only. To have a child with B or AB blood group, at least one of the parent should have one copy of $I^B$ allele. Thus, the correct answer is option C.