If mother have only 'b,' antibody & blood group of father is 'O' the blood group of child may be `:-`

Options

A. A `&` b
B. AB
C. A,O
D. O

Answer

To determine the possible blood group of a child when the mother has only B antibodies and the father has blood group O, we can follow these steps:

### Step 1: Understand the Blood Group System
Blood groups are determined by the presence of antigens on the surface of red blood cells. The main blood group antigens are A and B. The presence of antibodies in the blood is opposite to the antigens present.

### Step 2: Analyze the Mother's Blood Group
The mother has only B antibodies. This means she cannot have A antigens because if she did, her body would produce antibodies against them. Therefore, the mother must have A antigens. Her blood group can be either B (genotype IBIB or IBi) or AB (genotype IAIB).

### Step 3: Analyze the Father's Blood Group
The father has blood group O. Blood group O has no A or B antigens, which means his genotype is ii.

### Step 4: Determine Possible Genotypes of the Child
Now, we can combine the possible genotypes of the mother and father:
- If the mother is B (IBIB or IBi):
- If she is IBIB (homozygous), the child can only inherit IB from the mother and i from the father, resulting in blood group B (IBi).
- If she is IBi (heterozygous), the child can inherit either IB or i from the mother, resulting in blood groups B (IBi) or O (ii).

- If the mother is AB (IAIB):
- The child can inherit IA from the mother and i from the father, resulting in blood group A (IAi).

### Step 5: Conclusion
The possible blood groups for the child, considering the mother's antibodies and the father's blood group, are:
- Blood group A (if the mother is AB)
- Blood group B (if the mother is B)
- Blood group O (if the mother is B and heterozygous)

Thus, the possible blood groups for the child may be A, B, or O.

### Final Answer
The blood group of the child may be A, B, or O.

---