Some quick things as I'm not going to write a dissertation on natural selection:
What are the statistical odds of a ball python reaching maturity in the wild? They aren't the greatest, so what would the odds be a lone morph hatching out and reaching breeding age? Then what are the odds that morph successfully breeding and passing on it's traits? Perhaps it's a male and breed with a female but that female had already bred and none of the offspring are the morphs or she slugs out. If that male morph missed out on just one season, then who's to say it even survives to the next breeding season?
Then you got even worse odds if that morph is recessive.
You may actually get a small pocket of morphs, say pastel's in one area, then a predator comes in (say a honey badger) and eats that small isolated group. Well there went all your pastels. Same could go for a disease wiping them out. Or humans coming in and catching all the snakes for food or the leather trade. NERDS albino water monitor was found at a skinning station. I can only imagine the number of morphs killed over the last couple hundred years for food or leather that we don't know about.
Inevitably some will always make, hence why we have the morphs we do.









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