What would be the possible blood group of a child whose mother has blood group B and father has AB blood group?

Options

A. O
B. B
C. B & I
D. O & A

Answer

To determine the possible blood groups of a child whose mother has blood group B and father has blood group AB, we can follow these steps:

### Step 1: Identify the Genotypes of the Parents
- The mother has blood group B. The possible genotypes for blood group B are:
- IB IB (homozygous)
- IB IO (heterozygous)

- The father has blood group AB. The genotype for blood group AB is:
- IA IB

### Step 2: Set Up a Punnett Square
We will use a Punnett square to determine the possible genotypes of the child based on the possible genotypes of the mother and father.

1. **If the mother is IB IB:**
- Possible gametes from the mother: IB
- Possible gametes from the father: IA, IB

The Punnett square would look like this:
```
IA IB
__________
IB | IA IB | IB IB |
```

Possible blood groups from this cross:
- IA IB → Blood group AB
- IB IB → Blood group B

2. **If the mother is IB IO:**
- Possible gametes from the mother: IB, IO
- Possible gametes from the father: IA, IB

The Punnett square would look like this:
```
IA IB
__________
IB | IA IB | IB IB |
IO | IA IO | IB IO |
```

Possible blood groups from this cross:
- IA IB → Blood group AB
- IB IB → Blood group B
- IA IO → Blood group A
- IB IO → Blood group B

### Step 3: List All Possible Blood Groups
From both scenarios, we can summarize the possible blood groups for the child:
- If the mother is IB IB: Possible blood groups are AB and B.
- If the mother is IB IO: Possible blood groups are AB, B, and A.

### Conclusion
The possible blood groups for the child, considering both scenarios, are:
- Blood group A
- Blood group B
- Blood group AB

### Final Answer
The possible blood groups of the child are A, B, and AB.