Genetic Code

The Genetic Code

Second Base in Codon
F i r s t B a s e i n C o d o n		A	G	U	C		T h i r d B a s e i n C o d o n
	A	Lysine	Arginine	Isoleucine	Threonine	A
		Lysine	Arginine	Methionine	Threonine	G
		Asparagine	Serine	Isoleucine	Threonine	U
		Asparagine	Serine	Isoleucine	Threonine	C
	G	Glutamic Acid	Glycine	Valine	Alanine	A
		Glutamic Acid	Glycine	Valine	Alanine	G
		Aspartic Acid	Glycine	Valine	Alanine	U
		Aspartic Acid	Glycine	Valine	Alanine	C
	U	"Stop" Codon	"Stop" Codon	Leucine	Serine	A
		"Stop" Codon	Tryptophan	Leucine	Serine	G
		Tyrosine	Cysteine	Phenylalanine	Serine	U
		Tyrosine	Cysteine	Phenylalanine	Serine	C
	C	Glutamine	Arginine	Leucine	Proline	A
		Glutamine	Arginine	Leucine	Proline	G
		Histidine	Arginine	Leucine	Proline	U
		Histidine	Arginine	Leucine	Proline	C

A codon is a series of three messenger RNA nucleotides which, in the genetic code specifies a particular amino acid.

To determine the amino acid coded for by a triplet codon, first find the row in the left column (yellow background) corresponding to the first letter of the codon. Move to the left across that row to the column headed by the second letter in the codon. Finally, from the four possible choices specified by the first two letters, select the one in the row corresponding to the third letter of the codon in the column on the right (dark red background.) For example, the codon UUC codes for the amino acid phenylalanine.

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