if you have a 50% het for axanthic, that means that your new python has 50% chance of being het for axanthic or 50% chance of being just a normal. If the guy is het axanthic and you breed him to a normal female, each baby would be 50% possible het for axanthic. If the guy is not het axanthic and you breed it to a normal female, all you would get is normals. You have to breed a het to a het to produce a homozygous animal.