Which is correct for Turner's syndrome?

Options

A. It is a case of monosomy.
B. It causes sterility in females.
C. Absence of Barr body.
D. All of the above.

Answer

### Step-by-Step Solution:

1. **Understanding Turner Syndrome**: Turner syndrome is a genetic condition that affects females, characterized by the presence of a single X chromosome instead of the usual two (XX). The typical chromosomal makeup in Turner syndrome is 44 chromosomes plus one X chromosome, denoted as 44, X0.

2. **Analyzing the Options**:
- **Option 1**: "It is a case of monosomy."
- Turner syndrome is indeed a case of monosomy because there is a missing X chromosome (X0).
- **Option 2**: "It causes sterility in females."
- Females with Turner syndrome are typically sterile due to the underdevelopment of the ovaries.
- **Option 3**: "Absence of the body."
- This refers to the absence of a second X chromosome, which is crucial for normal female development. In Turner syndrome, the lack of this chromosome can lead to various developmental issues.
- **Option 4**: "All of the above."
- Since all the previous statements are correct, this option must also be correct.

3. **Conclusion**: Based on the analysis of the options, the correct answer is **Option 4: All of the above**. All statements about Turner syndrome are accurate.