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A silent mutation is a type of point mutation in the DNA sequence where a single nucleotide is changed, but the resulting amino acid sequence of the protein it codes for remains unchanged. This is because there is more than one codon (three-nucleotide sequence) that can code for the same amino acid, a phenomenon known as codon degeneracy or redundancy.

A neutral mutation is any change in the DNA sequence that has no impact on the organism's fitness, meaning it does not affect their ability to survive and reproduce. This may include changes in non-coding regions of the DNA or in coding regions, where the mutation causes a change in the amino acid sequence of a protein, but the overall protein function is not affected. This is because the effects of the mutation are either masked by other cellular mechanisms or are negligible to the organism's fitness.

The key differences between silent and neutral mutations are: 1. Silent mutations always occur in the coding regions of the DNA, where they do not cause a change in the amino acid sequence of the protein. In contrast, neutral mutations can occur both in coding or non-coding regions and may or may not cause changes in the amino acid sequence. 2. Silent mutations involve only point mutations (single nucleotide change), whereas neutral mutations can be any type of mutation, including point mutations, insertions, or deletions. 3. Silent mutations solely rely on the degeneracy of the genetic code while neutral mutations involve other cellular mechanisms or negligible effects on the organism's fitness. In summary, a silent mutation is a specific subtype of neutral mutation that occurs only in coding regions and does not result in a change of the amino acid sequence due to codon degeneracy, while a neutral mutation has a broader definition and includes any mutation without an impact on the organism's fitness.