Rb gene is located on which chromosome?

**Core Concept**
The Rb gene, also known as the retinoblastoma tumor suppressor gene, is a crucial gene involved in regulating cell cycle progression and preventing uncontrolled cell growth. It is a classic example of a tumor suppressor gene, which when mutated or inactivated, can lead to cancer. The Rb gene plays a key role in the G1 to S phase transition of the cell cycle.

**Why the Correct Answer is Right**
The Rb gene is a tumor suppressor gene that encodes a protein responsible for binding to and inhibiting the E2F transcription factor, preventing the transcription of genes necessary for cell proliferation. The Rb protein is phosphorylated by cyclin-dependent kinases (CDKs) during the G1 phase of the cell cycle, leading to its inactivation and release of E2F. The Rb gene is located on the long arm of chromosome 13 (13q14.2). The loss of function of the Rb gene is associated with retinoblastoma, a rare form of eye cancer that typically affects children.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a correct location for the Rb gene.
* **Option B:** This chromosome is not associated with the Rb gene.
* **Option C:** This is not the correct location for the Rb gene.

**Clinical Pearl / High-Yield Fact**
The Rb gene is a classic example of a tumor suppressor gene, and its inactivation is associated with retinoblastoma, a rare form of eye cancer. The Rb gene is also involved in other cancers, including osteosarcoma and bladder cancer.

**Correct Answer:** C. Chromosome 13.