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In a given DNA segment, ATG ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by this DNA segment will result in
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Change in the first amino acid only
For the given DNA segment, if the first base gets mutated, then there will be a change in the first amino acid only because each amino acid consists of a triplet code consisting of three nucleotides bases. When for a given DNA segment the first base gets mutated then only that particular part consisting of three bases and specific for a particular amino acid will change.
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