Question

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?
missense
nonsense
silent
frameshift

Explanation:

A missense mutation is where a single - base substitution results in a codon that codes for a different amino acid. Here, the DNA sequence changes from TTG to TCG and the resulting protein has a different amino - acid sequence. Nonsense mutations create a stop codon prematurely. Silent mutations do not change the amino - acid sequence. Frameshift mutations occur due to insertions or deletions that shift the reading frame.

Answer:

A. missense