I acknowledge your continuing interest in discussing evidence.Not at all. I'm more than willing to discuss the evidence you present. However, you have to provide something that isn't just an assertion of what you believe. You can't declare there to be a "universal" genetic code and use it as evidence for common descent. You could assert that all living things share DNA, which is your evidence for common descent.
That'd be fine, I reckon.
It is not merely that DNA (and the mechanism that uses the related RNA) is the chemical used to store genetic information in all known living species, but that there has not yet been found any exception to the principle that the ribosomes and transfer RNA of any one species can read the DNA of any other species.
What the DNA codes for is protein amino acid sequence. A triple of three bases form a codon, and that codon is translated into which amino acid joins the protein chain next. The same 20 amino acids are found across all living species as well.
From the Holy Wikipedia, here is an explanation of the codons. This could be a length of messenger RNA copied from a gene on a chromosome in the nucleus:
Also from the HW, here's the actual code used (the Genetic Code, as it's called). You get your codon, say 'CGT' and start in the middle at C, move out to G then to T, and on the outside of that segment you find the amino acid molecule that will be added next to the protein chain:
All species use this system, and it doesn't matter what the source of DNA is.
Stuart
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