The blood group of the father is B and that of a daughter is AB. The genotype of the mother be :

Options

A. `I^A I^A " or " I^0I^0`
B. `I^A I^B ` only
C. `I^A I^A " or " I^A I^B`
D. `I^A I^0` only

Answer

To determine the genotype of the mother based on the given blood groups of the father and daughter, we can follow these steps:

### Step 1: Understand Blood Group Genetics
Blood groups are determined by the presence of specific antigens on the surface of red blood cells. The ABO blood group system includes:
- Type A: Genotype can be \( I^A I^A \) (homozygous) or \( I^A i \) (heterozygous)
- Type B: Genotype can be \( I^B I^B \) (homozygous) or \( I^B i \) (heterozygous)
- Type AB: Genotype is \( I^A I^B \) (only one possibility)
- Type O: Genotype is \( ii \) (homozygous)

### Step 2: Analyze the Father's Blood Group
The father has blood group B. His possible genotypes are:
- \( I^B I^B \) (homozygous)
- \( I^B i \) (heterozygous)

### Step 3: Analyze the Daughter's Blood Group
The daughter has blood group AB, which means her genotype must be \( I^A I^B \).

### Step 4: Determine Possible Genotypes of the Mother
To produce a daughter with blood group AB, the mother must contribute the \( I^A \) allele. Therefore, the possible genotypes of the mother could be:
1. \( I^A I^A \) (homozygous A)
2. \( I^A i \) (heterozygous A)
3. \( I^A I^B \) (homozygous AB)

### Step 5: Eliminate Impossible Genotypes
The mother cannot have the genotype \( ii \) (blood group O) because she would not be able to contribute the \( I^A \) allele needed for the daughter to be AB.

### Conclusion
The possible genotypes of the mother are:
- \( I^A I^A \)
- \( I^A i \)
- \( I^A I^B \)

However, since the question asks for the most appropriate genotype of the mother, the best answer is \( I^A I^A \) or \( I^A i \).

### Final Answer
The genotype of the mother could be \( I^A I^A \) or \( I^A i \).

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