A woman has a child with klinefelter 's syndrome .Number of barr bodies present in the child is

Options

A. One
B. Two
C. Three
D. None

Answer

To solve the question regarding the number of Barr bodies present in a child with Klinefelter's syndrome, we can follow these steps:

### Step 1: Understand Klinefelter's Syndrome
Klinefelter's syndrome is a genetic condition that occurs in males who have an extra X chromosome. The typical chromosomal pattern for a male is 46,XY, but in Klinefelter's syndrome, it is 47,XXY (or variants with more X chromosomes).

### Step 2: Determine the Number of Barr Bodies
Barr bodies are inactivated X chromosomes found in the cells of females and in males with extra X chromosomes. The formula to calculate the number of Barr bodies is:
\[ \text{Number of Barr bodies} = \text{Number of X chromosomes} - 1 \]

### Step 3: Apply the Formula
In Klinefelter's syndrome (47,XXY), there are 2 X chromosomes. Using the formula:
\[ \text{Number of Barr bodies} = 2 - 1 = 1 \]

### Step 4: Conclusion
Therefore, the number of Barr bodies present in a child with Klinefelter's syndrome is 1.

### Final Answer
The number of Barr bodies present in the child with Klinefelter's syndrome is **1**.

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