You mean, the DNA has the genes. Also, some research suggests that the folding of the DNA affects phenotype expression as well, so it's the DNA and the genes in the DNA.
No, I mean the genes have DNA. All things have DNA, with a couple of exceptions. Suggest" means there is some doubt. It is really irrelevant, if the parents do no have the gene for bones, it will no have the DNA for bones. Think about this. The guess of what the first life form was, did not have bones. How could it eve have a kid with bones?
Actually, mutations can happen in many different ways. Retro virus for instance. And enough changes will have larger change of the expression. Many experiments have confirmed this.
I know. In fact it is doubtful we know all the things that cause mutations.