Question

Turner syndrome occurs due to

• A. XO
• B. XXY
• C. XYY
• D. XXX

Hint:

Turner syndrome is a chromosomal disorder caused by a missing X chromosome.

Answer 1

The Correct Option is A

Step 1: Understanding Turner Syndrome.
Turner syndrome occurs when one of the X chromosomes is missing or partially missing. This is represented by the karyotype XO.
Step 2: The genetic cause.
In Turner syndrome, females have only one full X chromosome and no second sex chromosome.
Step 3: Conclusion.
Thus, the correct answer is ((A) XO.
Final Answer: \[ \boxed{\text{XO}} \]