That is pretty much what I meant by how does duplex work, thank you! Not that it was especially relevant to Hapsburg, but this is all super interesting to me. Usually when I try to look this stuff up it's either way beyond me or on an elementary level, repeating the same stuff I already know. Your answers are perfect.
I had assumed that Jared's (Hapsburg's father) Silkie mother was a walnut because I read Silkies have walnut combs. She and Jared's father had eight offspring, four of which had single combs, four of which had combs like Jared's, so I concluded she had (P, p) (R, r) going by what I learned from this site. I realize now that probability-wise and from what you've said, it makes more sense to conclude that she just plain didn't have a walnut comb and was (p, p) (R, r), giving me 50% single combed offspring, and leaving Jared with the same genotype. Is that all fair reasoning?
Regarding beards and wattles, about half of the eight, including Jared, had appeared to be non-bearded, so either their one gene for a beard was expressing itself very weakly or his mother was not so pure as I thought. Jared's non-bearded father had small wattles but he wasn't fully grown before I lost him. (Yeah, he started early.)
Sorry for all the rambling, I just like knowing details about what I have in my flock, even if I'm not going to breed certain individuals (i.e. Hapsburg's mother). I really appreciate your answers.