The number of Barr bodies in an individual with an XXXY sex chromosome configuration would be 2.

Here's the step-by-step explanation:

1. Barr bodies are inactivated X chromosomes in a cell. They are named after the discoverer Murray Barr.

2. Normal females, with two X chromosomes (XX), have one Barr body in their cells—the inactivated second X chromosome.

3. Normal males, with one X and one Y chromosome (XY), have no Barr bodies because their single X chromosome is active.

4. In the case of an individual with an XXXY sex chromosome configuration, there are three X chromosomes and one Y chromosome.

5. The body only needs one active X chromosome, so the additional two X chromosomes would be inactivated and become Barr bodies.

So, an XXXY individual would have 2 Barr bodies in each of their cells.

Question

The number of Barr bodies in an individual with an XXXY sex chromosome configuration would be 2.

Here's the step-by-step explanation:

1. Barr bodies are inactivated X chromosomes in a cell. They are named after the discoverer Murray Barr.

2. Normal females, with two X chromosomes (XX), have one Barr body in their cells—the inactivated second X chromosome.

3. Normal males, with one X and one Y chromosome (XY), have no Barr bodies because their single X chromosome is active.

4. In the case of an individual with an XXXY sex chromosome configuration, there are three X chromosomes and one Y chromosome.

5. The body only needs one active X chromosome, so the additional two X chromosomes would be inactivated and become Barr bodies.

So, an XXXY individual would have 2 Barr bodies in each of their cells.

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