Sometimes they can cause non frameshift mutations. And those basically mean that we do not shift the reading frame of the mRNA molecule, the reading frame that is used by our ribosome. What we basically do is we insert or we delete one or more amino acids, but all the other amino acids basically remain exactly the same. So, to conclude, we have two main types of mutations. We have point mutations, which are basically mutations on a single nucleotide, and these are also known as base pair substitutions or base pair mutations. Now, we also have frameshift mutations, and frame shift mutations are caused by insertions or deletions.