Question

What should be the nature of genetic code if there would have been $65$ amino acids?

Answer 1

The nature of genetic code doesn't depend on the number of amino acids. It remains the same universally. There are 20 types of amino acids and 2 more amino acids are recently discovered. These are selenocysteine and pyrrolysine, which codes for UGA and UAG respectively.

Genetic code is unambiguous means each codon specifies one amino acid only. Example: GUC codes for only valine and no other amino acid.

Genetic code is degenerate means, many codons can code for one amino acid. Example: GUU, GUA and GUG all code for valine.