Under the concept of triplet code, the segment of DNA specifying one full functional polypeptide chain is known as:-

Options

A. transposon
B. operon
C. codon
D. cistron

Answer

To answer the question regarding the segment of DNA that specifies one full functional polypeptide chain under the concept of the triplet code, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Triplet Code**: The triplet code refers to the way in which sequences of three nucleotides (codons) in DNA or RNA correspond to specific amino acids during protein synthesis. Each codon codes for one amino acid.

2. **Identify Key Terms**: In the context of genetics, several terms are relevant:
- **Transposon**: A segment of DNA that can move around to different positions within the genome of a single cell.
- **Operon**: A functional unit of DNA that contains a cluster of genes under the control of a single promoter, which can be transcribed together.
- **Codon**: A sequence of three nucleotides that together form a unit of genetic code in a DNA or RNA molecule.
- **Cistron**: A term used to describe a segment of DNA that codes for a single polypeptide chain.

3. **Focus on the Question**: The question asks specifically for the segment of DNA that specifies one full functional polypeptide chain.

4. **Choose the Correct Answer**: Among the options provided (Transposon, Operon, Codon, Cistron), the term that best fits the description of a segment of DNA coding for one full functional polypeptide chain is **Cistron**.

5. **Conclusion**: Therefore, under the concept of the triplet code, the segment of DNA specifying one full functional polypeptide chain is known as a **Cistron**.

### Final Answer:
The segment of DNA specifying one full functional polypeptide chain is known as a **Cistron**.

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