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The genes that cause dogs to be SEAL are still not fully understood by even the Scientists themselves. What we do know so far, is that one of the K genes, (there are 3 series that we know of on the K gene) specifically Kb seems to be responsible for the seal coloring, which can be Black Seal, Chocolate Seal, Blue Seal, or Lilac Seal. These dogs shine through a different color, usually red, but can be fawn, gray, or even green shades, from under the coat, especially in the sun. They are most always only 2 colors, the second color being white, as this particular K gene HIDES the color at agouti, so any tan points if present will be hidden. True SEAL dogs will DNA [KbN ayay] [KbN ayat] [KbN atat] [KbKb ayay] [KbKb ayat] [KbKb atat]. Note: some labs will render results of a Kbr dog as Kb, which is NOT SEAL but Brindle.
9-17-15 Update: As per our experience breeding the SEAL gene, we have realized that a SEAL dog can carry Hidden Brindle. The SEAL covers over the brindle and since there is still no way of testing this genes sequences, the only way to know for sure that your SEAL carries brindle or not is to breed with a non-brindle dog to see if you get brindle/trindle babies. Given enough babies you can pretty much determine if your dog is just Kb or Kb+Kbr. One of our Chocolate Seal girls had trindles in her first litter bred to a clear dog. Our Chocolate Seal Stud Gunner, however, evidently does not carry brindle. He has sired 4 litters with all clear dogs and has never thrown a brindle.
Genotype for Black Gene: [Kb] and/or [atat]
Overview: Black Bulldogs are the most common of the 4 Rare Colors in AKC English Bulldogs. The black should be shiny & look black against black objects or in the sun unless the seal gene is involved which can show a different color undertone to the black coat. These dogs may or may not have a fawn undercoat when the hair is rubbed backwards. The nose, footpads, & eyeliner are always a true black.
Dominant Black K Locus | Seal | Brindle
KK, KN, NN
Coat colors in mammals is achieved by the production of two pigments, eumelanin aka black, and pheomelanin aka red or yellow. Most of the time, these 2 pigments are controlled by MC1R and Agouti genes. Coat color research in dogs has shown that a third gene, Dominant Black, K locus is involved. This gene produces either dominant black, brindle, and fawn color. The Seal Color is also somehow produced involving this gene.
K/K 2 copies of dominant black, dog will be visibly trindle, seal, or brindle
K/N 1 copy of dominant black, dog will be visibly trindle, seal, or brindle
N/N Dog does not have the dominant black mutation
The genes that cause dogs to be Brindle are not yet fully understood, even by the scientists themselves. What we do know so far is that one of the markers on the K gene, specifically Kbr, is responsible for the brindle color on the coat, whether it be a partial or full brindleing, such as the Tan Points being brindled, which is what we call Trindle. The agouti gene overrides the brindle gene on the dogs body coat & makes it look solid color, except for any area where the dog is tan pointed or white.
The K gene is confusingly called Dominant Black, because this gene shows as brindle, and black (seal). ALL brindle dogs carry at least one K gene. It takes only one since it is a Dominant gene to show on the dog.
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