The webbed leaves are a reccesive trait but the Ducksfoot strain is truebreeding meaning it only has the recessive trait. If you cross it with something else the trait will dissappear but should appear in 25% of the offspring if you make F2 seeds from the offspring. Unless you crossed it with a webbed leaf carrier then you would get 50% webbed offspring in the first generation, but it's my understanding that other than Ducksfoot it's a pretty rare trait.