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Three major comb alleles with multiple allelic mutations on each of them and many more modifiers.

It's a Pea Comb, no doubt in my mind. The expression of pea combs will vary from breed to breed.

Those chicks are P/p+(none of them are P/P), So far the only test that has been done on the inheritance of D^C and D^V has been on Single comb. https://jhered.oxfordjournals.org/content/82/2/169.full.pdf+html

The Butter Cup Comb Genetics it's a different mutation from the regular V Type comb. The gene causing the buttercup type of Du- plex comb is a weak semi dominant with 100% penetrance in males and 68% penetrance in fe-males. 21% of Heterozygote females show a single comb There are two allelic...