[PeterPrinciple]

All this “mutation” you talk about is existing genetic code. There is no new genetic information involved.

[JimSEA]

That is very simpily not true. A mutation is a change in the nucleotide sequence of the geonome of an organism. See Wikipedia for a straightforward explaination. There are also any number of YouTube videos that go into as much depth as you care to go. Begin with learning just what a nucleotide is and a gene.