What kind of mutation causes a shift in the way a ribosome will read the mrna

For the answer to the question above asking what kind of mutation causes a shift in the way, a ribosome will read the mRNA?I think this question is referring to Synonymous Mutation. Synonymous mutations can affect transcription, splicing, mRNA transport, and translation, any of which could alter phenotype, rendering the synonymous mutation non-silent.

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What kind of mutation causes a shift in the way a ribosome will read the mRna
 Synonymous Mutation

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