The b locus
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|Ash red bar, probably also sooty.|
|Mutation type||Basic colour|
|Alleles||brown, blue/black, ash red|
Including wild type, this locus has three alleles. Brown is recessive to wild type, whereas ash red is dominant. As a sex-linked locus, it is possible for cocks to carry two different alleles (or two of the same), whereas hens can only carry a single allele, and will always express the allele they're carrying.
Ash red cocks who are carrying a copy of a less dominant allele will often show "ink spots" indicating the presence of the other gene.
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