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this is great info. I love barring.
https://www.backyardchickens.com/forum/uploads/15886_my_chickens_745.jpg
Kev, this is my polish nn cross. I have crossed her with many different roos. she is the mom of both the frizzles a couple pages back. I have a genetic question for you. her chicks are almost always the color of the roo. they also have the features of the roo. beard,muff,crest,skin color. Is this unusual?
So you're playing with the NN gene and other genes, that's awesome. Fun isn't it?
As for your question, it probably is coincidence. If the genes your roosters had were dominant genes and/or roo were pure for said genes, that would be the explanation. For example, crest, beard/muff are both dominant genes(actually more like "dominant, but variable in how it shows in the crosses"). This girl lacks the beard/muff so what you're seeing in the case of beard/muffs is more like a "bearded roo x non-bearded hen" cross.. the results would have been overall the same if the sex of parents reversed, non-bearded roo x bearded hen would have produced bearded chicks.
Skin color is slightly trickier because the black skin is dominant but it is affected by unrelated genes(barring, Id<causes white/yellow legs in most non-barred birds>, even some feather colors, etc). In a non complicated cross, black skin x non-black skin will throw black skin chicks no matter what parent is which.