The mutation described, where the polypeptide sequence changes from Ser-Val-Pro to Ser-Val-Stop, is categorized as a d.) A nonsense mutation.
Step-by-step explanation:
A nonsense mutation is a type of mutation that introduces a premature stop codon in the DNA sequence, leading to the truncation of the resulting polypeptide. In this case, the original codon for Pro (proline) has been mutated to a stop codon, indicating the end of protein synthesis prematurely. As a result, the polypeptide is terminated at the position of the mutation, preventing the complete formation of the protein.