Children of a father with 'O' blood group and mother with 'AB' blood group would be

Options

A. O
B. AB
C. O or AB
D. A or B

Answer

To solve the question of what blood groups the children of a father with 'O' blood group and a mother with 'AB' blood group would have, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes of the Parents:**
- The father has an 'O' blood group. The genotype for 'O' blood group is represented as **ii** (homozygous recessive).
- The mother has an 'AB' blood group. The genotype for 'AB' blood group is represented as **IAIB** (co-dominant).

2. **Set Up a Punnett Square:**
- We will use a Punnett square to determine the possible genotypes of the offspring.
- The father's alleles (ii) will be placed on one side of the square, and the mother's alleles (IAIB) will be placed on the other side.

```
IA IB
----------------
i | IAi | IBi |
----------------
i | IAi | IBi |
----------------
```

3. **Determine the Possible Genotypes of Offspring:**
- From the Punnett square, we can see the possible combinations:
- **IAi** (A blood group)
- **IBi** (B blood group)
- Therefore, the offspring can either have blood group A or blood group B.

4. **Conclusion:**
- The possible blood groups of the children from this cross are **A** and **B**.
- The children cannot have blood group O or AB because:
- Blood group O requires two recessive alleles (ii) which the father cannot provide.
- Blood group AB requires both IA and IB alleles, which the father cannot provide either.

### Final Answer:
The children of a father with 'O' blood group and a mother with 'AB' blood group would have blood groups **A or B**.