A mutation causes a sequence of DNA that has the nucleotides TTG to be changed to TCG. The resulting protein has a different sequence of amino acids. Which type of mutation is this?

A missense mutation changes a DNA codon so that it specifies a different amino acid. Here, the change from TTG to TCG results in a different amino acid in the protein, so this is a missense mutation. A silent mutation would not change the amino acid, while a nonsense mutation creates a stop codon.

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