Number of Barr bodies in XXXX female would be

Options

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

Answer

To determine the number of Barr bodies in a female with the genotype XXXX, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Barr Bodies**: Barr bodies are the inactive X chromosomes in a female's cells. In humans, females typically have two X chromosomes (XX), and one of these X chromosomes becomes inactive in each cell, forming a Barr body.

2. **Formula for Barr Bodies**: The number of Barr bodies can be calculated using the formula:
\[ \text{Number of Barr Bodies} = \text{Number of X chromosomes} - 1 \]
This formula indicates that for every pair of X chromosomes, one will be inactivated and thus counted as a Barr body.

3. **Identify the Number of X Chromosomes**: In the case of an XXXX female, there are 4 X chromosomes present.

4. **Apply the Formula**: Using the formula from step 2:
\[ \text{Number of Barr Bodies} = 4 - 1 = 3 \]

5. **Conclusion**: Therefore, the number of Barr bodies in an XXXX female is 3.

### Final Answer:
The number of Barr bodies in an XXXX female would be **3**.

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