Partial Pea Combs From Single Comb Parents? Help

[Mosey2003]

Anyway, I'm definitely culling the hens that show anything odd from the breeding pen. If I can manage to get to a show this fall I'm going to try to get some new stock from my cock breeder. Otherwise, I have one unrelated pullet that should be laying in January that I will single mate and hatch from. And I'll do some other single mating hatches and see what I see. Definitely going to keep these all marked.

 

[Mosey2003]

From the other board:

R. D. Crawford page 194

When working with pea and walnut-combed birds and various crosses , Petroff(1929) observed a significant deficiency of pea combed phenotype from a few matings. Test crosses indicated to him, that a dominant inhibitor gene was preventing the pea comb gene from expressing itself. He found also this gene in two out of three single-combed Black Minorca hens he tested.
This gene was apparently quite selective in interfering with the expression of the P gene, but had no effect on the rose comb gene(R) , so the genotypic pea- combed birds appeared to be single-combed, and genotypic walnut-combed birds appeared to be rose-combed

This is what I think may be going on here.

 

[Mosey2003]

Just wanted to update that I found this thread and post and what is shown in the Marans as a carnation type comb is exactly what I'm seeing in my chicks and one of the hens. This post:
https://www.backyardchickens.com/th...s-for-reference-purposes.385769/#post-5590671

Where it comes from originally in my hens, I have no idea. But I'll try to breed away from it, and if it turns out I can't, I'll scrap the whole line. Glad to see someone else has a name for it though.

 

[Mosey2003]

I wanted to just edit this rather than bump it to the top, but apparently you can only edit within a certain timeframe. I want to include what I found in case anyone else searches for something similar.

I finally hit on the right search terms, and have determined that this defect is an inverted comb. It's more common in rose combed breeds, where it's called an inverted spike or inverted leader. I did find posts saying it can also hide in single combs, and this is rather apparent from what I see in these hens and chicks, plus the few other instances I found where people have posted seeing it in single combs like the Marans thread and a couple others I found, one being a black Jersey Giant chick afflicted.

Case closed. Clear defect. Will play with the normal appearing hens and see if it comes out again or not, but am marking everyone and will have a fresh pullet of the same line as my cock for next year.