Question

Number of Barr bodies in XXXX female is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The Correct Option is C

The question asks for the number of Barr bodies in an XXXX female. To tackle this, we first need to understand what Barr bodies are and how they are formed:

Barr bodies are inactivated X chromosomes found in the cells of females. In general, the number of Barr bodies in a cell is calculated using the formula: N - 1, where N is the number of X chromosomes.

Let's apply this to the scenario given in the question:

1. The XXXX female has 4 X chromosomes (XXXX). According to the formula mentioned above, we calculate the number of Barr bodies as follows:

• N = 4 (Number of X chromosomes)
• Number of Barr bodies = 4 - 1 = 3

Therefore, an XXXX female has 3 Barr bodies.

The correct answer is: 3.

This resolves the confusion commonly faced with additional X chromosomes, where each X beyond the first is transformed into a Barr body to maintain genetic balance.