The sequence of nucleotide in DNA and RNA directs, the oriler of amino acid in a protein. There is code of each 20 amino acid found in Protein. Each code word is called carbon and is made up of 2 bases such as AG; there would be only 16 codons not enough to code for 20 amino acids. If each codon were made up of 3 bases, such as AGC, there would be 64 colons, more than enough to code for 20 different amino acids. There genetics code is triplet code and each codon has 3 nucleotide bases.
- Genetic code is degenerate i.e. most amino acids have more than one codon e.g: leucine, serine and arginine have different codons.
- This helps code against harmful effect of mutations.
- Genetic code is unanbiguous Each triplet code has only one meaning.
- The code has 'Start' and ''Stop'' signals. There is only one start signal but 3 stop signals.
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