The karyotype of a patient with Androgen Insensitivity Syndrome is:
## **Core Concept**
Androgen Insensitivity Syndrome (AIS) is a genetic condition that affects sexual development before birth and during puberty. It is characterized by the inability of cells to respond to androgens, which are male hormones. This condition is associated with a specific karyotype.
## **Why the Correct Answer is Right**
The correct karyotype for a patient with Androgen Insensitivity Syndrome is **46,XY**. This is because AIS occurs in individuals who are genetically male (having one X and one Y chromosome) but have a mutation in the androgen receptor gene, which prevents them from responding to androgens. As a result, despite having testes and producing androgens, the external genitalia develop in a female direction.
## **Why Each Wrong Option is Incorrect**
- **Option A:** . This karyotype represents a typical female, which is not associated with AIS since individuals with AIS have a male karyotype but female external genitalia.
- **Option B:** . This karyotype is associated with Turner syndrome, a condition that affects females, causing short stature and ovarian failure, and is not related to AIS.
- **Option D:** . This karyotype is associated with Klinefelter syndrome, a condition that affects males, causing infertility and developmental issues, and is not related to AIS.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that individuals with AIS have female external genitalia and are often raised as females, but they have testes (usually undescended) and a male karyotype. This condition highlights the importance of androgen action in male sexual differentiation.
## **Correct Answer:** . 46,XY