Locus K
£31.00
The K locus determines major coat patterns. KB produces dominant black, kbr gives brindle, and ky allows A-locus patterns to appear. Dogs without KB show colours based on the A locus, such as fawn, tan points, brindle, or recessive black.
Locus K (Dominant Black)
The K locus controls dominant black coat colour and interacts with the A locus to determine the dog’s final pattern.
Alleles at the K locus:
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KB (Dominant Black)
– Completely overrides the A locus.
– Dogs with one or two copies (KB/KB or KB/ky) appear solid black (or solid chocolate if bb). -
kbr (Brindle)
– Allows brindle pattern (dark stripes on a lighter background).
– Only expressed if the dog also carries tan points or fawn at the A locus. -
ky (Recessive – Allows A locus expression)
– The dog’s coat colour and pattern will be determined entirely by the A locus (e.g., fawn, sable, tan points, black-and-tan).
Inheritance:
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KB is dominant over both kbr and ky.
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kbr is dominant over ky.
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A dog must inherit two copies of ky (ky/ky) to fully express the patterns of the A locus.
Why this test is useful:
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Identifies whether a dog is genetically solid black or will express A-locus patterns.
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Helps breeders avoid unexpected colours in litters.
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Detects brindle carriers, which may not always be visible depending on coat type.
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