That is not what I said. If there is observable difference between two populations, then indeed there might be two different strains at work. If you want to be

That is not what I said. If there is observable difference between two populations, then indeed there might be two different strains at work. If you want to be super pedantic, not all RNAs are mRNAs, and there might be difference between CUA and CUG in tRNA's behavior.