One parents has blood group A and the other parents has blood group B, the offsprings have which blood group

Options

A. AB only
B. O only
C. B only
D. A,B, AB, O

Answer

To determine the possible blood groups of offspring when one parent has blood group A and the other has blood group B, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes of the Parents**:
- The parent with blood group A can have two possible genotypes:
- Homozygous: \( I^A I^A \)
- Heterozygous: \( I^A i \)
- The parent with blood group B can also have two possible genotypes:
- Homozygous: \( I^B I^B \)
- Heterozygous: \( I^B i \)

2. **Determine the Gametes**:
- If we take the heterozygous forms for both parents (which will give us the most variety in offspring):
- Parent A (genotype \( I^A i \)) can produce gametes: \( I^A \) and \( i \)
- Parent B (genotype \( I^B i \)) can produce gametes: \( I^B \) and \( i \)

3. **Set Up the Punnett Square**:
- Create a Punnett square to visualize the combinations of the gametes:
```
I^B i
-----------------
I^A | I^A I^B | I^A i |
-----------------
i | I^B i | ii |
-----------------
```

4. **Analyze the Offspring Genotypes**:
- From the Punnett square, we can see the possible genotypes of the offspring:
- \( I^A I^B \) (Blood group AB)
- \( I^A i \) (Blood group A)
- \( I^B i \) (Blood group B)
- \( ii \) (Blood group O)

5. **Conclusion**:
- The possible blood groups for the offspring are:
- Blood group A
- Blood group B
- Blood group AB
- Blood group O

### Final Answer:
The offspring can have blood groups A, B, AB, or O.

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