Originally posted by twohybrid
The genetic code is universal (on earth!) except that some specialised yeast tRNAs have anti-codons not coresponding to the usual codon. Most genetics and biochemistry texts will have a table with the genetic code.
Thanks for that; now I know
Strange that I cannot find a straight answer to that simple question on my previous and extensive internet searches.
This would have certain implications for evolution for it would mean:
1, it must be difficult for organisms to evolve to change their codon language else many of them would have already done so! So, apparently, once an organism evolves a codon language, it is generally forever stuck with that codon language.
2, the fact that the codon language is universal to virtually all organisms and universal despite it being arbitrary and there being no biological cost of it being different from what it is, is yet further evidence of all life on Earth has common ancestry (not that further evidence of this is needed! )
It has also occurred to me the potential of artificially changing this codon language in all human cells (this would require replacing the whole genome with one written in the new language AND simultaneously changing all the tRNAs ) in the human body because this will, without any biological cost, instantly make as immune to all naturally occurring viruses because, if any of those viruses invaded such genetically altered cells, there protein-coding genes, being now written by evolution in the wrong language, would be mistranslated to produce junk non-fictional viral proteins instead of well shaped functional ones! It is this thought that is the real motive for my OP.