I have 6 golden laced wyandottes; I thought one of them might be a coo in lieu of a pullet due to the comb was developing different. She is now laying eggs. The only difference is her comb; it is not a rose comb like wyandottes have. Her comb is a single with seven points. I have 16 wyandottes of five differ breeds. At my peek in the poultry world; I have over 500 chickens. I have never seen this. What causes this, Recessive gene?