1. The dominance of the allele C+ of the recessive white gene c was previously thought to represent one of the relatively uncommon examples of complete dominance in the fowl.
2. In a study with cockerel‐breeding Partridge Wyandotte Bantams, dilution effects on both phaeomelanin and eumelanin were observed in C+ heterozygotes indicating that C+ is not completely dominant over its recessive allele.