Quote:
The rose comb is dominant over single comb and locus for these characters which are autosomal (not occuring on sex determining chromosomes). Assuming no differences genetically other than sex, a bird regardless of sex should have rose comb if homozygous or heterozygous for trait. Dominiques are considered to breed true for rose comb, therefore homozygous, although the single comb allele does exist at a low frequency within pure dominiques. You may have rare dom hen carrying the single comb allele or you have a mixup in terms of who the mother is.
Your F1 dominique hen x game rooster should all be rose combed just like the pure dominique unless hen is heterozygous as stated previously.
WHAT I WROTE ABOVE IS NOT CORRECT. To much boook reading with data to backup!