What would happen if the second letter in a codon UGG is changed to UAG by a mutation in mRNA ?

In the case of a mutation that changes the second letter of the codon UGC to UAG, the ribosome would recognize UAG as a stop codon, even though it was originally supposed to code for cysteine. As a result, translation would terminate prematurely, and the protein being synthesized would likely be shorter than it should be. This can have significant consequences, as the incomplete protein may not function properly, leading to potential health issues or malfunction of cellular processes. This type of mutation is known as a nonsense mutation, as it leads to the premature termination of protein synthesis.