## **Core Concept**
The insulin receptor gene plays a crucial role in encoding the receptor for insulin, which is essential for glucose regulation in the body. The location of the gene for the insulin receptor on a specific chromosome is vital for understanding genetic aspects of diabetes and insulin resistance.

## **Why the Correct Answer is Right**
The insulin receptor gene is located on **chromosome 19**. This gene encodes for the insulin receptor, a protein that, when activated by insulin, triggers a cascade of signaling pathways involved in glucose uptake and metabolism. The correct answer, chromosome 19, is significant because mutations in the insulin receptor gene can lead to insulin resistance and diabetes.

## **Why Each Wrong Option is Incorrect**
* **Option A:** Chromosome 1 is not associated with the insulin receptor gene. While chromosome 1 carries many important genes, the insulin receptor gene is not among them.
* **Option B:** Chromosome 11 is known for carrying genes like the insulin gene itself but not the insulin receptor gene.
* **Option D:** Chromosome 22 is associated with various genetic conditions but is not the location of the insulin receptor gene.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while the **insulin gene** is located on **chromosome 11**, the **insulin receptor gene** is on **chromosome 19**. This distinction is crucial for understanding the genetic basis of diabetes and the molecular mechanisms of insulin action.

## **Correct Answer:** . Chromosome 19