School Science Lessons
2018-08-06
Please send comments to: J.Elfick@uq.edu.au

1.0.0 Genetic code

Table of contents

Genetics, (Commercial)

2.0.0 Amino acids, DNA codons

3.0.0 Nucleic acid, nitrogenous bases


3.0.0 Nucleic acid, nitrogenous bases
A Adenine, 6-aminopurine, vitamin B4, C5H5N5
G Guanine, 2-​Amino-​6-​hydroxypurine, C5H5N5O.
C Cytosine, 4-​Amino-​2-​hydroxypyrimidine, C4H5N3O.
T Thymine (only in DNA), 2, 4-​Dihydroxy-​5-​methylpyrimidine, 5-Methyluracil, C5H6N2O2.
or
U Uracil (only in RNA), 2, 4-​Dihydroxypyrimidine, 2, 4-Pyrimidinediol, C4H4N2O2.

2.0.0 Amino acids DNA codons
The code for a amino acid is a 3 letter codon.
Most amino acids have more than one codon, e.g. phenylalanine has TTT and TTC.
End of chain has 3 codons.
The first letter in a codon is in position 1,
The second letter in a codon is in position 2
The third letter in a codon is in position 3.
After position 3 is END of chain.

Alanine, DNA codons

Arginine, DNA codons

Asparagine, DNA codons

Aspartic acid, DNA codons

Cysteine, DNA codons

Glutamine, DNA codons

Glutamic acid, DNA codons

Glycine, DNA codons

Histidine, DNA codons

Isoleucine, DNA codons

Leucine, DNA codons

Lysine, DNA codons

Methionine, DNA codons

Phenylalanine, DNA codons

Proline, DNA codons

Serine, DNA codons

Threonine, DNA codons

Tryptophan, DNA codons

Tyrosine, DNA codons

Valine, DNA codons

Amino acids and their 64 codons

Ala Alanine GCT, GCC, GCA, GCG

Arg Arginine CGT, CGC, CGA, CGG, AGA, AGG

Asn Asparagine AAT, AAC

Asp Aspartic acid GAT, GAC

Cys Cysteine TGT, TGC

Gin Glutamine CAA, CAG

Glu Glutamic acid GAA, GAG

Gly Glycine GGT, GGC, GGA, GGG

His Histidine CAT, CAT

Ile Isoleucine ATT, ATC, ATA

Leu Leucine TTA, TTG, CTT, CTC, CTA, CTG

Lys Lysine AAA, AAG

Met Methionine ATG

Phe Phenylalanine TTT, TTC

Pro Proline CCT, CCC, CCA, CCG

Ser Serine TCT, TCC, TCA, TCG

Thr Threonine ACT, ACC, ACA, ACG

Trp Tryptophan TGG

Tyr Tyrosine TAT, TAC

Val Valine GUU, GUC, GUA, GUG

END of chain TAA, TAG, TGA
Position 1 is called the 5' end
Position 3 is called the 3' end

AAA
AAC
AAG
AAT
ACA
ACC
ACG
ACT
AGA
AGG
ATA
ATC
ATG
ATT
CAA
CAG
CAT
CAT
CCA
CCC
CCG
CCT
CGA
CGC
CGG
CGT
CTA
CTC
CTG
CTT
GAA
GAC
GAG
GAT
GCA
GCC
GCG
GCT
GGA
GGC
GGG
GGT
GUA
GUC
GUG
GUU
TAA
TAC
TAG
TAT
TCA
TCC
TCG
TCT
TGA
TGC
TGG
TGT
TTA
TTC
TTG
TTT