Besides homozygous animals, the chances of having an animal always throw a gene get exponentially greater with each egg. You might have some people give you stories of luck. If that's what your looking for there are plenty of them out there and it is cool to hear them, but what your about to receive is not really information that pertains to anything, just good stories. I already have the math laid out if your curious.
Chance of heterozygous producing all morphs