I have made multiple crosses involving American Dominique hens. Chicks now about two weeks old and showing characteristics I have not seen before. First is Cackle Hatchery Dom (female) x American Game (male). Game is heterogyous for pea / single comb type. Second is Privett Hatchery Dom (female) x California Grey (male). California Grey is homozygous for single comb type. Comb of games which are homozygous for single comb are much smaller than that of California Grey. Chicks of first cross phenotypically are either rose comb or what looks at this time some sort of modified pea comb. I expected this. What I did not expect what the big beefy looking rose combs on the dom x California Grey. The combs are much bigger than normal rose combs of Privett or Cackle Hatchery doms. Ultimately I want small, tight, bright red rose combs that breed true. California grey looks to be taking me away from that characteristic. How many genes are involved with size of comb?