Albino Zebra Carpet python
One animal carrying both genes. Each one is inherited separately, so this combination is made by bringing them together rather than being a gene of its own.
Documented health finding on one of these genes
Zebra. As with Jaguar, the two-copy form is understood not to be viable, so a Zebra to Zebra pairing loses part of the clutch.
The two genes
How one is made
Both genes have to come together in the same animal. The pairing that does it most directly is Albino × Zebra, which works out every outcome and its odds.