In the mRNA codon, AGU encodes for serine (ser), GAG encodes for glutamic acid (glu), GGG encodes for glycine (gly) and UGG encodes for tryptophan (try). If an mRNA sequence was GGGGAGUGG and mutated so it now reads UGGGAGUGG, a new amino acid will replace

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The original mRNA sequence GGGGAGUGG encodes glycine (GGG), glutamic acid (GAG), and tryptophan (UGG). The mutation changes the first codon from GGG (glycine) to UGG (tryptophan), replacing glycine with tryptophan.

In the MRNA Codon, AGU Encodes for Serine (Ser), GAG