Number of X chromosomes in Turner 's syndrome is

Options

A. 3
B. 2
C. 1
D. Zero

Answer

To determine the number of X chromosomes in Turner’s syndrome, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Turner’s Syndrome**: Turner’s syndrome is a genetic condition that affects females. It is characterized by the presence of only one X chromosome instead of the usual two.

2. **Normal Chromosomal Composition**: In a typical female, the chromosomal composition is 44 autosomes and 2 X chromosomes, represented as 44XX.

3. **Identify the Chromosomal Abnormality**: In Turner’s syndrome, one of the X chromosomes is missing. This leads to a chromosomal composition of 44 autosomes and only 1 X chromosome.

4. **Count the X Chromosomes**: Since one X chromosome is missing in Turner’s syndrome, the total number of X chromosomes present is 1.

5. **Conclusion**: Therefore, the number of X chromosomes in Turner’s syndrome is 1.

### Final Answer:
The number of X chromosomes in Turner’s syndrome is **1**.

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