Would you expand on this a bit?? Does this mean that sometimes a rose comb will pop up and sometimes a pea comb?? Meaning if each bird carries one of each then 50% would have the cuhsion comb, but 25% the pea and 25% the rose?
Yes, when you mate up two breeders that are both hetero for P and R there will rose combs and pea combs and even single combs in their offspring. When breeders are "pure" (homozygous) for P and R, meaning they carry two copies of each gene, all chicks will have cushion combs. P and R are inherited independently of each other. Play around with Punnet squares and you will quickly discover all the different genetic combinations and probabilities of each. Fun stuff, but probably a little beyond the scope of many BYC readers.
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I believe you are correct, the walnut and cushion combs are genetically the same with the exception of the "smooth" modifier for the cushion comb (I'm sure there's a technical name, just don't remember it). But it's the same modifier that will reduce the number of points in a single comb or eliminate the bumps and spike on a rose comb.