Difference between revisions of "Genetic code"
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[[image:K12-DH10B-codon-usage.png|thumb|right|600px|[[Codon usage table]] of Eschericia coli K12 DH10B. The first three characters are the codon, the second character in parentheses is the amino acid coded for by the codon, and the percentage is the relative usage of that codon in the genome across all [[CDSs]].]] | [[image:K12-DH10B-codon-usage.png|thumb|right|600px|[[Codon usage table]] of Eschericia coli K12 DH10B. The first three characters are the codon, the second character in parentheses is the amino acid coded for by the codon, and the percentage is the relative usage of that codon in the genome across all [[CDSs]].]] | ||
| − | + | [[image:Mouse C57BL-6J chr2 codon usage table.png|thumb|right|600px|[[Codon usage table]] of chromosome 2 from a mouse strain.]] | |
| − | The genetic code is the translation framwork of [[mRNA]] nucleotide sequence to protein amino acid sequence. [[mRNAs]] are read 5' to 3' using triplets of nucleotides. These triplets of nucleotides are called codons, and each codon codes for a single amino acid or a stop signal to end translation. While there are 64 possible codons (4x4x4), there are 20-21 amino acids and a stop signal. Thus, multiple codons can code for the same amino acids or stop signal, and the genetic code is redundant. | + | The genetic code is the translation framwork of [[mRNA]] nucleotide sequence to protein amino acid sequence. [[mRNAs]] are read 5' to 3' using triplets of nucleotides. These triplets of nucleotides are called codons, and each codon codes for a single amino acid or a stop signal to end translation. While there are 64 possible codons (4x4x4), there are 20-21 amino acids and a stop signal. Thus, multiple codons can code for the same amino acids or stop signal, and the genetic code is redundant. While much of the genetic code is constant across all major domains of life, there are several modifications that are used by different groups of organisms. For example, |
Revision as of 12:38, 2 January 2010
Codon usage table of Eschericia coli K12 DH10B. The first three characters are the codon, the second character in parentheses is the amino acid coded for by the codon, and the percentage is the relative usage of that codon in the genome across all CDSs.
Codon usage table of chromosome 2 from a mouse strain.
The genetic code is the translation framwork of mRNA nucleotide sequence to protein amino acid sequence. mRNAs are read 5' to 3' using triplets of nucleotides. These triplets of nucleotides are called codons, and each codon codes for a single amino acid or a stop signal to end translation. While there are 64 possible codons (4x4x4), there are 20-21 amino acids and a stop signal. Thus, multiple codons can code for the same amino acids or stop signal, and the genetic code is redundant. While much of the genetic code is constant across all major domains of life, there are several modifications that are used by different groups of organisms. For example,
