Black Axanthic is recessive so you need two copies of the gene. You can not produce them using a normal in a single generation. You would have to breed the offspring of a normal x 66% het back to one another and there would be no telling if you even had the gene since the 66% het is also 33% chance of just being a normal as well. If he was het all the babies would only have a 50% shot of being het.
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