Chocolate: a sex-linked recessive plumage colour mutant of the domestic fowl.
1. A mating between Black Orpington bantams produced, in addition to blacks, a single female in which the black colouration was replaced by dark chocolate. 2. A mating of the chocolate-coloured female with a black male, F2 and backcross matings demonstrated that the chocolate phenotype is caused by a recessive sex-linked gene to which I assign the symbol *CHOC. 3. A mating of "chocolates' inter se yielded all chocolate offspring.
Carefoot
W C
WC
D000818:Animals; D001947:Breeding; D005241:Feathers; D005260:Female; D005808:Genes, Recessive / Q000235:genetics*; D008040:Genetic Linkage; D008297:Male; D009154:Mutation; D010641:Phenotype; D010858:Pigmentation / Q000235:genetics*; D011200:Poultry / Q000235:genetics*; D012730:Sex Chromosomes