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Are grammars for all DNA or RNA of differenent species and individuals the same ?If so,the languages generated by the grammar are the same,or DNA and RNA of differenent species and individuals are just subset or part of the languages generated by the grammar.Then why do we have to use the same grammar to describe different languages or subset of a language?

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What do you mean by 'grammar'? –  von Mises Sep 21 '13 at 16:14
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closed as unclear what you're asking by Mad Scientist Sep 21 '13 at 19:47

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By grammar I assume you are referring to the genetic code, the correspondence between codons and the amino acids they code for. If so, then the answer is no. While all of the existing codes are very similar, there are various codes around and each has certain codons coding for different amino acids.

For a list of known genetic codes, see here, the changes are usually minor and tend to be alternate START (methionine) codons.

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