## **Core Concept**
Turner syndrome is a genetic disorder that affects females, where one of the X chromosomes is missing or partially deleted. This condition leads to various physical and developmental abnormalities. The disorder is associated with specific chromosomal and clinical features.

## **Why the Correct Answer is Right**
The correct answer, , indicates that Turner syndrome is characterized by short stature, gonadal dysgenesis (underdeveloped ovaries), and other physical features. The most common chromosomal pattern in Turner syndrome is 45,X, where one X chromosome is completely or partially deleted. This leads to a lack of estrogen, causing delayed or absent puberty, infertility, and other characteristic symptoms.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option is incorrect because Turner syndrome is not associated with an extra X chromosome; rather, it involves a missing or abnormal X chromosome.
* **Option B:** - This option is incorrect as it does not accurately represent the typical chromosomal abnormality seen in Turner syndrome.
* **Option C:** - Although some individuals with Turner syndrome may exhibit mosaicism (e.g., 45,X/46,XX), the most characteristic and commonly associated chromosomal pattern is not listed here.

## **Clinical Pearl / High-Yield Fact**
A key clinical feature of Turner syndrome is short stature, and affected individuals often have a characteristic appearance, including a webbed neck, low-set ears, and heart defects. Early diagnosis and treatment with growth hormone and estrogen can significantly improve quality of life.

## **Correct Answer:** . 45,X.