Actually any type of genetic passing would make perfect sense. How do you think any base morph happened? A pastel was just born one day with none before it. Same with any other morph out there. It is a random flaw in the genetic code that makes a morph. I would go so far as to say that the first albino, pied, axanthic, and any other recessive gene first appeared as the homozygous form which then created the hets in the wild and not as 2 hets in the wild randomly mating and making the homozygous animal.