The genotype of blood group 'A' is

Options

A. `I^(A)I^(A)//I^(A)I^(O)`
B. `I^(B)I^(B)//I^(B)I^(O)`
C. `I^(A)I^(B)`
D. `I^(O)I^(O)`

Answer

To determine the genotype of blood group 'A', we need to understand the genetic basis of blood types. Blood groups are determined by the presence of specific antigens on the surface of red blood cells, which are inherited from our parents.

### Step-by-Step Solution:

1. **Understanding Blood Groups**:
- There are four main blood groups: A, B, AB, and O.
- These blood groups are determined by the presence of antigens A and B on the surface of red blood cells.

2. **Genetic Notation**:
- The alleles for blood groups are denoted as follows:
- \( I^A \) for blood group A
- \( I^B \) for blood group B
- \( i \) (or \( I^O \)) for blood group O

3. **Possible Genotypes for Blood Group A**:
- The genotype for blood group A can be either:
- Homozygous: \( I^A I^A \)
- Heterozygous: \( I^A i \) (where \( i \) represents the O allele)

4. **Analyzing the Options**:
- Given the options:
1. \( I^A I^A \)
2. \( I^A I^B \)
3. \( I^B I^B \)
4. \( I^O I^O \)
- The first option \( I^A I^A \) represents the homozygous condition for blood group A.
- The second option \( I^A I^B \) represents blood group AB.
- The third option \( I^B I^B \) represents blood group B.
- The fourth option \( I^O I^O \) represents blood group O.

5. **Conclusion**:
- Therefore, the genotypes for blood group A are \( I^A I^A \) or \( I^A i \). However, since the question asks for the genotype of blood group A, the most straightforward answer is \( I^A I^A \).

### Final Answer:
The genotype of blood group 'A' is \( I^A I^A \) or \( I^A i \).