Ultra Anerys carry both, Anery and the Ultra gen. So, Ultra is a gen that has an Hypomelanistic effect, but is genetically independent to the other known Hypo-gens.
So, a HypoAnery is better known as a Ghost corn and if you do not use the standard Hypo gen, but the Ultra one instead, you get different looking snakes that go into the direction we know from ghosts.