Why is codon made up of three why not one two or four ?
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We have four nitrogenous bases, A, U, G, C. If each
codon consists of one nucleotide sequence, we will have only four amino acids possible which will be actually one for each letter.
If each codon consists of 2 bases, you'd have only 16 possible amino acids (4^2) and 20 amino acid sequence is too less to constitute a protein molecule. Hence, with
3 nucleotides/codon, we have 64 (4^3) possible amino acids per codon sequence. This can be more than the requirement but is much necessary to code the 20 amino acids.
codon consists of one nucleotide sequence, we will have only four amino acids possible which will be actually one for each letter.
If each codon consists of 2 bases, you'd have only 16 possible amino acids (4^2) and 20 amino acid sequence is too less to constitute a protein molecule. Hence, with
3 nucleotides/codon, we have 64 (4^3) possible amino acids per codon sequence. This can be more than the requirement but is much necessary to code the 20 amino acids.
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