A man with blood group 'A' marries a women with blood group 'B'. What are all the posssible blood groups of their offsprings?

Options

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

Answer

To determine the possible blood groups of the offspring from a man with blood group 'A' and a woman with blood group 'B', we can follow these steps:

### Step 1: Identify the Genotypes of the Parents
- The man with blood group 'A' can have two possible genotypes:
- Genotype IAIA (homozygous)
- Genotype IAi (heterozygous)
- The woman with blood group 'B' can also have two possible genotypes:
- Genotype IBIB (homozygous)
- Genotype IBi (heterozygous)

### Step 2: Determine Possible Gametes
- If the man is IAi (heterozygous), he can produce two types of gametes:
- Gametes: IA and i
- If the woman is IBi (heterozygous), she can also produce two types of gametes:
- Gametes: IB and i

### Step 3: Create a Punnett Square
Using the gametes identified, we can create a Punnett square to visualize the possible combinations of alleles in the offspring.

| | IB | i |
|---------|--------|--------|
| **IA** | IAIB | IAi |
| **i** | IBi | ii |

### Step 4: Identify Offspring Blood Groups
From the Punnett square, we can identify the possible blood groups of the offspring:
- IAIB → Blood group AB
- IAi → Blood group A
- IBi → Blood group B
- ii → Blood group O

### Step 5: List All Possible Blood Groups
The possible blood groups of the offspring are:
1. Blood group A
2. Blood group B
3. Blood group AB
4. Blood group O

### Conclusion
Thus, the possible blood groups of the offspring from a man with blood group 'A' and a woman with blood group 'B' are A, B, AB, and O.

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