To Pop22
The DuckLeaf trait is recessive, so you won't see any webbed leaves in the F1. You'll need to cross the F1s together to make F2s, and you should have webbed leaves in 25% of the offspring. You'll need to cross 2 of the webbed F2s to get consistant webbing, and even then, it may not be enough to get consistant webbing. You may need to push it out a few more generations.
I'm working on a similar project and crossed my WINDOWSILL(an amazing low odor, resinous, auto that grows well on my windowsill) with a Frisian Duck. I hit a snag this summer, as all of my F1s turned out to be female. They were extremely resistant to Ag+ solutions, and wouldn't produce any pollen. But the F1s were some damn fine smoke. I'll try again next year. Good Luck with your project!