The Genetic Code

Second Position of Codon
T C A G
F
i
r
s
t

P
o
s
i
t
i
o
n		 T
TTT Phe [F]
TTC Phe [F]
TTA Leu [L]
TTG Leu [L]
TCT Ser [S]
TCC Ser [S]
TCA Ser [S]
TCG Ser [S]
TAT Tyr [Y]
TAC Tyr [Y]
TAA Ter [end]
TAG Ter [end]
TGT Cys [C]
TGC Cys [C]
TGA Ter [end]
TGG Trp [W]
T
C
A
G
T
h
i
r
d

P
o
s
i
t
i
o
n
C
CTT Leu [L]
CTC Leu [L]
CTA Leu [L]
CTG Leu [L]
CCT Pro [P]
CCC Pro [P]
CCA Pro [P]
CCG Pro [P]
CAT His [H]
CAC His [H]
CAA Gln [Q]
CAG Gln [Q]
CGT Arg [R]
CGC Arg [R]
CGA Arg [R]
CGG Arg [R]
T
C
A
G
A
ATT Ile [I]
ATC Ile [I]
ATA Ile [I]
ATG Met [M]
ACT Thr [T]
ACC Thr [T]
ACA Thr [T]
ACG Thr [T]
AAT Asn [N]
AAC Asn [N]
AAA Lys [K]
AAG Lys [K]
AGT Ser [S]
AGC Ser [S]
AGA Arg [R]
AGG Arg [R]
T
C
A
G
G
GTT Val [V]
GTC Val [V]
GTA Val [V]
GTG Val [V]
GCT Ala [A]
GCC Ala [A]
GCA Ala [A]
GCG Ala [A]
GAT Asp [D]
GAC Asp [D]
GAA Glu [E]
GAG Glu [E]
GGT Gly [G]
GGC Gly [G]
GGA Gly [G]
GGG Gly [G]
T
C
A
G

 

The Genetic Code is usually called "universal" because it is used by all known organisms (animals, plants, fungi, archaea, bacteria, and viruses). The DNA bases are:

A = adenine G = guanine C = cytosine T = thymine

The diagram above shows the relationship between the codons (sequence of three bases) and the amino acids they code for. The code for mRNA would be identical except for the fact that RNA contains U (uracil) rather than T. Below is a table showing the amino acids specified by each codon sequence.

Ala: Alanine  Cys: Cysteine  Asp: Aspartic acid  Glu: Glutamic acid
Phe: Phenylalanine  Gly: Glycine His: Histidine  Ile: Isoleucine 
Lys: Lysine Leu: Leucine  Met: Methionine Asn: Asparagine
Pro: Proline Gln: Glutamine Arg: Arginine Ser: Serine
Thr: Threonine Val: Valine Trp: Tryptophane Tyr: Tyrosisne

Back to Kac Web