Exceptions of Genetic Code
Due to similar codons being seen in all organisms, the genetic code is universal along with the same START and STOP signals in the genes of microorganisms and plants. Therefore there are few exceptions which include one or two STOP codons of an amino acid.
Though GUG is meant for valine both the codons GUG and AUG code for methionine as starting codons which breaks the property of non-ambiguousness. Therefore, few codes are different from universal code or non-ambiguous code.
Genetic Code – Molecular Basis of Inheritance
CBSE Class12- Molecular Basis Of Inheritance- Genetic Code: The sequence of nucleotides in deoxyribonucleic acid and ribonucleic acid which determines the amino acids sequence of proteins is known as Genetic code. DNA consists of information for protein sequences. RNA consists of four nucleotides: adenine (A), guanine (G), cytosine (C), and uracil (U). The genetic code is made up of three nitrogen bases which are known as the triplet code.