Which is best used for sex differentiation(Kerala 2008 repeat)
**Core Concept**
Sex differentiation is determined by the presence of specific chromosomes and hormones. The **SRY gene** on the Y chromosome plays a crucial role in testis development.
**Why the Correct Answer is Right**
The correct answer is related to the **Barr body**, which is used for sex differentiation. The **Barr body** is an inactive X chromosome in females, and its presence can be used to determine the sex of an individual.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not directly related to sex differentiation.
**Option B:** This option is also incorrect as it does not play a primary role in sex differentiation.
**Option C:** This option is incorrect because, although related to genetics, it is not the best method for sex differentiation.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** is not provided, however, the correct answer is related to the presence of **Barr bodies** or other genetic markers.
**Clinical Pearl / High-Yield Fact**
The presence of a **Barr body** is a key factor in determining the sex of an individual, particularly in cases where sex is ambiguous.
**Correct Answer:** D. Barr body