The number of chromosomes in Turner's syndrome is

Options

A. 45
B. 43
C. 44
D. 42

Explanation

**Step-by-Step Solution:**

1. **Understanding Turner Syndrome**: Turner syndrome is a genetic condition that affects females, characterized by the absence of one of the X chromosomes.

2. **Chromosomal Composition**: Normally, females have two X chromosomes (XX) and a total of 46 chromosomes (44 autosomes + 2 sex chromosomes). In Turner syndrome, one of the X chromosomes is missing.

3. **Identifying Monosomy**: The term "monosomy" refers to the loss of one chromosome from a pair. In the case of Turner syndrome, it is the loss of one X chromosome, leading to a chromosomal formula of 44 + X0 (where X0 indicates the absence of one X chromosome).

4. **Calculating Total Chromosomes**: Therefore, the total number of chromosomes in a female with Turner syndrome is:
- 44 (autosomes) + 1 (the remaining X chromosome) = 45 chromosomes.

5. **Conclusion**: The number of chromosomes in Turner syndrome is 45.

**Final Answer**: The number of chromosomes in Turner’s syndrome is 45.

---