If somatic cells of a human male contain single barrbody, the genetic composition of the person would be
or
The genotype of a boy having sexual characters of a girl is

Options

A. XYY
B. XXY
C. XO
D. XXXY

Answer

To solve the question regarding the genetic composition of a human male with a single Barr body and the genotype of a boy exhibiting female sexual characteristics, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Barr Bodies**:
- Barr bodies are inactivated X chromosomes found in the somatic cells of females. In males, who typically have one X and one Y chromosome (XY), there are no Barr bodies. However, if a male has one Barr body, it indicates the presence of an extra X chromosome.

2. **Determining Genetic Composition**:
- Since the question states that a human male has one Barr body, it implies that he has one extra X chromosome. Therefore, the genetic composition of this individual would be XXY. This condition is associated with Klinefelter syndrome.

3. **Identifying the Genotype of the Boy with Female Characteristics**:
- A boy exhibiting female sexual characteristics is also indicative of Klinefelter syndrome, where the individual has an additional X chromosome. Thus, the genotype of this boy would also be XXY.

4. **Conclusion**:
- Therefore, the genetic composition of the person with a single Barr body is XXY, and the genotype of the boy having sexual characteristics of a girl is also XXY.

### Final Answer:
- The genetic composition of the person would be **XXY**.
- The genotype of a boy having sexual characters of a girl is **XXY**.