I found this stuff too...
"The pea allele (P) is the dominant allele of the pea comb gene. Chickens that carry at least one dominant rose allele and are homozygous for the recessive pea comb allele (R_pp) will have a rose comb. Similarly, chickens that carry at least one dominant pea comb allele and are homozygous for the recessive rose comb allele (rrP_) will have a pea comb. Chickens that are homozygous for both the recessive rose comb allele and the recessive pea comb allele (rrpp) will have a single comb."
(https://www.nature.com/scitable/popular-discussion/504)
"The pea allele (P) is the dominant allele of the pea comb gene. Chickens that carry at least one dominant rose allele and are homozygous for the recessive pea comb allele (R_pp) will have a rose comb. Similarly, chickens that carry at least one dominant pea comb allele and are homozygous for the recessive rose comb allele (rrP_) will have a pea comb. Chickens that are homozygous for both the recessive rose comb allele and the recessive pea comb allele (rrpp) will have a single comb."
(https://www.nature.com/scitable/popular-discussion/504)
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