And this is known as a non frame shift mutation because the reading frame is not actually shifted and because the majority of the amino acid in the sequence is actually unchanged. Now, let's move on to the second category known as point mutation. So, a point mutation, also known as a base pair mutation or a base pair substitution, is basically a change of a single nucleotide on that DNA template. So, if the point mutation does not actually change the amino acid that is produced, and in this case, it is known as a silent mutation. Now, a silent mutation can either arise on the non coding region of the DNA or on the coding region of the DNA. And the reason a silent mutation can arise on the coding region of the DNA is because our genetic code is degenerate.