No. of Barr bodies in xxx female

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine the number of Barr bodies in a triple X female (XXX), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Barr Bodies**: Barr bodies are inactivated X chromosomes in females. Each female typically has two X chromosomes (XX), and one of these X chromosomes is inactivated, resulting in one Barr body.

2. **Identify the Chromosomal Composition**: In a triple X female, the chromosomal composition is XXX. This means there are three X chromosomes present.

3. **Calculate the Number of Barr Bodies**: The formula to calculate the number of Barr bodies is:
\[ \text{Number of Barr Bodies} = (\text{Total X chromosomes}) - 1 \]
For a triple X female:
\[ \text{Number of Barr Bodies} = 3 - 1 = 2 \]

4. **Conclusion**: Therefore, the number of Barr bodies in a triple X female is 2.

### Final Answer:
The number of Barr bodies in a triple X female is **2**.

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