Breeding a Blue Gene to this gold female will likely not give you what you are hoping for. The Blue Gene JD's only carry one copy of the blue gene and the gold carries two copies of the gold gene. If you breed these together, you should get healthy normal looking JD's. All of them will carry the recessive gold gene and half of them will carry the recessive blue gene. The problem is that you don't know which ones have the recessive blue gene unless you breed them and even then you need to breed them to something with known genetics. If you randomly pair up the fry from this cross, you might get lucky and have them produce some golds, electric blues and platinum JD's, or you might just end up with 25% gold and the rest look like normal JD's. You cannot tell if a JD carries the blue gene by how it looks - they all look like wild type JD's.
So depending on what you are trying to do, this will determine what you want to pair this gold female with. If you want more golds, then breed her with another gold and you will get 100% gold JD fry. If you want to diverify the genes, you can breed her to a standard JD to get gold gene fry that look like wild type JD's - these can then be bred to a gold JD (should produce 50% gold fry) or to each other (should produce 25% gold fry). If you want to mix the Gold and Electric Blue, then you should really breed her to an Electric Blue male. All the fry will carry both gold and blue genes. I would recommend buying a platinum JD from someone else to get more diverse genetics and breed that fish to the gold gene blue gene fry. This should produce around 25% Platinum JD's, 25% Electric Blue JD's that carry the gold gene, 25% Gold JD's that carry the blue gene, and 25% gold gene-blue gene standard looking JD's.
As I said it depends on what you are trying to do.
