Triplet code First position Third position (5 end) Second position (3 end) C Phe Ser Tyr Cys Phe Ser Tyr Leu Ser Stop Stop ucAG Leu Ser Stop Trp Leu P Hi Ar rg Leu Pro His Ar rg C Leu Pro GIn Arg Leu Pro GIn Arg Ile Thr Asn Ser lle Thr A Ser le ys ro Met Thr Lys Arg A Asp Gly ucAGUcAGUcA Va Ala sp Gly G Ala Glu Gly Va Ala Glu y
Triplet code
The genetic code is degenerate 64 codons, but only 20 amino acids, so that, a single amino acid is coded for by several different codons, that is, degenerate Synonyms: different codons specify the same amino acid
The genetic code is degenerate • 64 codons, but only 20 amino acids, so that, a single amino acid is coded for by several different codons, that is, degenerate. • Synonyms:different codons specify the same amino acid
Triplet code Codon and anticodon: a triplet of bases in a specific tRNA molecule. each base is the codon base-pairs with its complementary base in the anticodon Wobble base-pairing
Triplet code • Codon and anticodon: a triplet of bases in a specific tRNA molecule. each base is the codon base –pairs with its complementary base in the anticodon. • Wobble base-pairing
Degeneracy of the genetic code Table 26-4 Degeneracy of the genetic code umino Number of Amino Number of acid codons acid odons Ala Leu Met p Cys GI Glu 622222423 Phe Pro Se 62124641 Thr T His Tyr e
Degeneracy of the genetic code
Wobble rules The Wobble Rules of Codon-Anticodon Pairing 5 Base of Anticodon 3'Base of Codon CAUG GUACU G 04 0C
Wobble rules