[Right Wing Professor]

Yes, but WHY does a tRNA code for an amino acid? What is there about it that says that this group of nucleotides "means" this amino acid? It's a code. Why does ... mean 'S'?

Are you asking if there's any reason, beyond accidental, for the association of specific codes with particular amino acids? There are some speculative ideas floating around about this, but little experimental evidence.

[Tantumergo]

"Are you asking if there's any reason, beyond accidental, for the association of specific codes with particular amino acids? There are some speculative ideas floating around about this, but little experimental evidence."

Yes, that is precisely what I'm asking - do you happen to know what any of these speculations involve?