It would not be possible to have all those 3 Genes in one snake. These genes are Allelic genes so when you breed a Highway (yb gravel) to a normal (WT), the Yb will pass on to half the clutch and gravel will pass on to the other half only, as this these are allelic traits from this pairing of Highway to normal you will never have a Highway in the clutch. So you see there would never be a chance to stack three genes from this Allelic complex.
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