AP BIOLOGY

Detailed explanation-1: -The genetic code includes 64 possible permutations, or combinations, of three-letter nucleotide sequences that can be made from the four nucleotides. Of the 64 codons, 61 represent amino acids, and three are stop signals.

Detailed explanation-2: -Complete answer: This is because one of the features of genetic codes is degeneracy. 3)Out of 64 codon combinations, only 61 codons code for amino acids, the rest 3 codons are ‘stop’ codons and they do not code for any amino acids. The stop codons are given by sequences UAA, UAG, and UGA.

Detailed explanation-3: -Of these 64 codons, 61 represent amino acids, and the remaining three represent stop signals, which trigger the end of protein synthesis. Because there are only 20 different amino acids but 64 possible codons, most amino acids are indicated by more than one codon.

Detailed explanation-4: -Out of 64 codons, 61 codons code for 20 types of amino acid.

Detailed explanation-5: -Four nitrogen bases make triplet codon and each encodes one amino acid out of 20 amino acids and provide plenty of information in the DNA molecule to specify the placement of all 20 amino acids. So, there are 64 codons in genetic code dictionary because the genetic code is a triplet.