More DNA info?

I realized my last question was missing the emphasis that I was asking whether an evolutionist can try to say that a species can become another species through the loss of information in dna during a mutation. What would be required to happen inorder for a species to evolve into another species if it was actually possible?Geoff

PS folks, Yes I realize this looks like it got cut off, but I was really done, so it's okay. ;)