During DNA replication, a mistake occurs in which a single letter is replaced with a different one. This is called substitution mutation, and it can occur in many types of cancer. Instead of the nitrogenous bases TAC, the DNA now codes for GAC.

Part 1: identify the sequence of complementary mRNA nucleotides for the original DNA, TAC, and the mutated DNA, GAC.

Part 2: Use the codon table above to determine if this mutation in the DNA code will cause a change in the amino acid. Explain your reasoning.