**Degeneracy of Codon**
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**Core Concept**
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Degeneracy of codon refers to the phenomenon where more than one codon can code for the same amino acid. This is due to the redundancy of the genetic code, where multiple codon sequences can be translated into the same amino acid. The genetic code is considered almost universal, with some minor variations across different species. This redundancy allows for slight variations in the genetic code without affecting the overall amino acid sequence.

**Why the Correct Answer is Right**
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The degeneracy of codon is due to the wobble hypothesis proposed by Francis Crick. According to this hypothesis, the third base in a codon (the 5' end) can be variable and still be recognized by the ribosome during protein synthesis. This allows for multiple codons to code for the same amino acid, resulting in the degeneracy of the genetic code. The wobble hypothesis is supported by the fact that many amino acids are encoded by more than one codon.

**Why Each Wrong Option is Incorrect**
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**Option A:** This option is a distractor and does not relate to the degeneracy of codon.

**Option B:** This option is incorrect because it refers to the concept of tRNA's ability to recognize multiple codons, but not the degeneracy of codon itself.

**Option C:** This option is incorrect because it refers to the concept of frameshift mutations, which occur when the reading frame of the genetic code is disrupted.

**Clinical Pearl / High-Yield Fact**
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The degeneracy of codon is a fundamental concept in molecular biology, and understanding it is crucial for understanding the genetic code and its variations across different species.

**Correct Answer: C. Frameshift mutations**