*Please do not choose this option for Silkies who do not yet have real feathers. This does not work with chick down. Please use blood spots on coffee filters for silkies that aren’t old enough to have real feathers yet.
DNA Testing – Chocolate Feather Gene
$25.00
Chocolate Feathering Test (TYRP1 Gene – Sex-Linked Recessive Mutation)
The chocolate feathering trait in chickens is caused by a sex-linked recessive mutation on the TYRP1 gene, located on the Z chromosome. This mutation dilutes black pigment (eumelanin), resulting in a rich chocolate-brown coloration instead of solid black.
Because it’s sex-linked, the gene behaves differently in males and females:
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Males have two Z chromosomes (ZZ), and must inherit two copies of the chocolate allele (b/b) to display the trait.
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Females have one Z chromosome (ZW), so a single copy of the chocolate allele (b/-) is enough for them to express the phenotype.
This test detects whether the chocolate allele (b) is present or absent in your bird’s DNA.
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