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  4. The number of codons effective in coding twenty amino acids:

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Q. The number of codons effective in coding twenty amino acids:

KCETKCET 2022Molecular Basis of Inheritance

Solution:

George Gamow in 1954, pointed out the possibility of a three-letter code i.e. triplet codon. This will give 4 x 4 x 4 = 64 codons which are more than enough to code for twenty amino acids. Out of these 64 codons, 3 codons are stop codons. Hence, 61 effective codons are there for the synthesis of twenty amino acids.