Blood stains are found at the site of a murder. If DNA profiling technique is to be used for identifying the criminal, which of the following is ideal for use?

Options

A. Serum
B. Erythrocytes
C. Leucocytes
D. Platelets

Answer

To solve the question regarding which component is ideal for DNA profiling from blood stains found at a murder site, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Purpose of DNA Profiling**:
DNA profiling, also known as DNA fingerprinting, is a technique used to compare DNA sequences from different individuals. It identifies variations in specific regions of DNA, particularly in repetitive DNA sequences.

2. **Identify the Components of Blood**:
Blood consists of several components, including:
- Serum: The liquid part of blood that does not contain blood cells.
- Erythrocytes (Red Blood Cells): Cells that carry oxygen but lack a nucleus.
- Leukocytes (White Blood Cells): Cells involved in the immune response that contain a nucleus and DNA.
- Platelets: Cell fragments involved in clotting that also lack a nucleus.

3. **Evaluate Each Option**:
- **Option A: Serum** - Lacks blood cells and therefore does not contain DNA. Not ideal.
- **Option B: Erythrocytes** - Enucleated (no nucleus), hence no DNA. Not ideal.
- **Option C: Leukocytes** - Contain a nucleus and DNA, making them suitable for DNA profiling. Ideal choice.
- **Option D: Platelets** - Also enucleated, so they do not contain DNA. Not ideal.

4. **Conclusion**:
The only component that contains DNA and is suitable for DNA profiling is **Leukocytes (White Blood Cells)**.

### Final Answer:
**C. Leukocytes**

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