That's actually not really the case. What you're referring to is line breeding, which is a good practice, but not really a primary focus of most people in the hobby (selecting good examples, yes - line breeding, not so much). Most of the single gene morphs were found in the wild looking much like they still do today. Morph ball pythons have only really been a thing for 25 years or so, and have really only taken off in the last... 10 or so? Here's a pretty good write-up found right here on this site that'll make for some good light reading if you're interested: https://ball-pythons.net/forums/show...-for-Beginners.