Out of 64 codons , 61 codons code for 20 types of amino acid. It is called

Options

A. Degeneracy of genetic code
B. Overlapping of gene
C. Wobbling of codon
D. Universility of codons

Answer

To solve the question regarding the condition where 61 out of 64 codons code for 20 types of amino acids, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Codons**:
- Codons are sequences of three nucleotides in mRNA that correspond to specific amino acids or stop signals during protein synthesis.
- There are a total of 64 possible codons (4^3 combinations of the four nucleotides: A, U, C, G).

2. **Identifying the Codons that Code for Amino Acids**:
- Out of these 64 codons, 61 codons are known to code for amino acids, while 3 codons are stop codons (UAA, UAG, UGA) that signal the termination of protein synthesis.

3. **Understanding the Concept of Degeneracy**:
- The fact that 61 codons correspond to only 20 amino acids indicates that multiple codons can code for the same amino acid. This phenomenon is known as the degeneracy of the genetic code.

4. **Historical Context**:
- The concept of degeneracy was discovered by scientists Marshall W. Nirenberg and Har Gobind Khorana, who helped elucidate the genetic code.

5. **Conclusion**:
- Therefore, the condition where multiple codons can code for a single amino acid is referred to as "degeneracy of the genetic code."

### Final Answer:
The condition is called **Degeneracy of Genetic Code**.

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