How? Tell me how a mutation in a banana is going to make a whale?

Take corn. Mutate the hell out of it. What do you get? New corn! Take a banana. Mutate it till your head hurts! What do you get? A new type of banana! Show me, where are the fossils of the transition organisms? ...There are none.

Mutation is shuffling and changing genes that already exist. Not adding more like evolution suggests.