How many codons codes for one amino acid
Three nucleotides encode an amino acid. So there's one Codon per amino acid.
- The three-letter design of codons means that the four nucleotides found in mRNA—A, U, G, and C—may produce a total of 64 different combinations. Of these 64 codons, 61 are amino acids, and the remaining three are stop signals that activate the end of protein synthesis. Since there are only 20 distinct amino acids but 64 possible codons, most amino acids are indicated by more than one codon.
- This phenomenon is known as redundancy or degeneracy and is important to the genetic code because it minimizes the adverse effects that improperly positioned nucleotides can have on protein synthesis. Another aspect that tends to minimize these potentially detrimental consequences is the fact that there is no overlap in the genetic code. This means that the three nucleotides inside a given codon are only part of that codon—so they are not found in any of the adjacent codons.
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