If the amel has no hets then i'm pretty sure (not a morph master!) that you can only visually get normals (when paired to anything without the amel gene), amels (when paired to anything with the amel gene) and ultramels (when paired to something with the ultra gene) ....i think
f1 = first filial = first generation of offspring from unrelated parents. If you then breed those babies back to each other or to one of their parents that is the f2 (second filial) and so on....
not really, but if you know which generation they are you'll know how much inbreeding there has been and thus when it would be wise to outcross to other lines.