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No, each nucleotide would still pair with one other—there would just be an additional possible purine/pyrimidine pair (i.e., A:T + G:C + X:Y).
As for transcription errors, you’d only have 36 potential codons (6^2^) instead of 64 (4^3^), so it seems like the process could be more robust.
Translation errors seem like biggest problem, with the current system you have some amount of redundancy where sometimes a single point mutation still gives the same codon but you would lose that with less base pairs per codon
Oh, I misunderstood. Yeah, in that case there isn't such an increase in risk of transcription errors. I think it's still increased slightly, because each nucleotide could become one of five others instead of one of three others, so it might still be easier for a stray high-energy particle to cause a conversion. Depends on how they're formed.
But, I'm not any kind of biologist.