My lines are a mixed bag but i have crider lines in my project which have been known to not produce kinks. As far as this post goes. I apoligize i was under the understanding that we were talking about ball pythons considering the poll. If we are talking about ball pythons then it would be nearly impossible not to flirt with genetic flaws. Also ball python breeding has come so far in a short period of time and more people are breeding them then any other snake. With that said it is not hard to believe that these genetic flaws can be manipulated and corrected over time and selective breeding. For example i got into a pissing match a few months ago about the spider wobble. I have been breeding spider combos off of my original male i bought for 15k back in 2002 from rob at then spiderballs.net. that male had no wobble at all. It was 8 clutches before i saw a wobble. Great odds. The spider that came out with the wobble was never bred. I sold it to a lady who still has it today as a pet. Now im not saying i have never produced any wobblers since but i do take breeding seriouslly and do select breeding to ensure the greatest odds. These other snakes you mention to be free from genetic flaws could be a real strong genetic animal or the face not as much work has been put in to them to discover any flaws. As we push to open genetic windows there will always be flaws that we uncover. The fact that mainstream breeding of snakes is still in its infancy im sure you will see these flaws in the future. We are manipulating natures way plain amd simple. We the breeders are the scientists.