The short repeating sequence of DNA useful in DNA fingerprinting are

Options

A. VNTR
B. Codons
C. Introns
D. Exons

Answer

To solve the question regarding the short repeating sequences of DNA that are useful in DNA fingerprinting, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding DNA Fingerprinting**:
- DNA fingerprinting is a technique used to identify individuals based on their unique DNA profiles. It often relies on specific regions of DNA that vary greatly among individuals.

2. **Analyzing the Options**:
- **Option 1: VNTR (Variable Number Tandem Repeat)**:
- VNTRs are short sequences of DNA that are repeated multiple times in a row. The number of repeats can vary between individuals, making them useful for DNA profiling.
- **Conclusion**: This is a correct option as VNTRs are indeed used in DNA fingerprinting.

- **Option 2: Codons**:
- Codons are sequences of three nucleotides that correspond to specific amino acids in protein synthesis. They are not used for DNA fingerprinting.
- **Conclusion**: This option is incorrect.

- **Option 3: Introns**:
- Introns are non-coding regions of a gene that are transcribed into RNA but are not translated into proteins. While they can vary between individuals, they are not typically used in DNA fingerprinting.
- **Conclusion**: This option is incorrect.

- **Option 4: Exons**:
- Exons are the coding regions of a gene that are expressed and translated into proteins. Similar to introns, they are not primarily used for DNA fingerprinting.
- **Conclusion**: This option is incorrect.

3. **Final Answer**:
- The only option that correctly identifies a short repeating sequence of DNA useful in DNA fingerprinting is **Option 1: VNTR**.