Which of the following karyotype is seen in a nineteen year old female with sho stature, wide spread nipples and primary amenorrhoea?
**Core Concept**
The underlying principle being tested is the correlation between specific genetic abnormalities and their phenotypic manifestations, particularly in relation to disorders of sex development. This involves understanding the **karyotype**, which is the complete set of chromosomes in an individual's cell, and how variations in the karyotype can lead to distinct clinical syndromes.
**Why the Correct Answer is Right**
Given the symptoms of short stature, wide-set nipples, and primary amenorrhea in a 19-year-old female, the most likely diagnosis is Turner syndrome. Turner syndrome is characterized by a **45,X** karyotype, where one of the X chromosomes is missing. This condition affects females and is known for causing short stature, delayed or absent puberty, and infertility, among other features. The **45,X** karyotype leads to hormonal imbalances and developmental issues, consistent with the symptoms described.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not match the classic karyotype associated with Turner syndrome.
**Option B:** Similarly, this option does not align with the expected karyotype for Turner syndrome.
**Option D:** This choice is also incorrect as it does not correspond to the karyotype typically seen in Turner syndrome.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that Turner syndrome is the most common sex chromosome disorder and affects about 1 in 2,500 live-born females. The **45,X** karyotype is the most common chromosomal pattern found in these individuals.
**Correct Answer:** Correct Answer: C. 45,X.