In the genetic code dictionary, how many codons are used

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In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?

1. 60
2. 20
3. 64
4. 61

Correct Option: D

Out of a total of 64 codons, 3 codons do not make any sense. Hence only 61 codons are used in the formation of the 20 essential amino acids (polypeptides).