Question

In Klinefelter syndrome, the number of sex chromosomes is:

• A. XXY
• B. XYO
• C. XYY
• D. XXX

Hint:

Klinefelter syndrome is associated with an extra X chromosome, leading to XXY instead of the usual XY.

Answer 1

The Correct Option is A

Step 1: Klinefelter Syndrome Overview.
Klinefelter syndrome is a genetic condition that affects males, where they have one extra X chromosome. The typical male karyotype is XY, but individuals with Klinefelter syndrome have XXY.
Step 2: Conclusion.
Thus, the correct number of sex chromosomes in Klinefelter syndrome is XXY.
Final Answer: \[ \boxed{\text{XXY sex chromosomes in Klinefelter syndrome.}} \]