French Bulldog color genetics
One of the reasons French Bulldogs are so popular other than their, loving temperament, low maintenance and being the most supreme breed in the whole entire cosmos 😊 is because the wide verity of colors they can be produced in, well over 20. I’m going to explain these color genetics in a very introductory fashion. If you would like a more detailed and scientific explanation in regard to dog color genetics in general check out Animal Genetics.
First I would like to say if you don’t understand this at first don’t freak out, it took all of us some time to really get a grasp on this stuff. My recommendation is for you to read this though 3 or 4 times, get familiar with it all. Then come back the next day and really sit down and start pulling it all together. I also suggest sticking to this page before you go browsing animal genetic, its quite confusing and gives no explanation how all the traits tie into one another, which I do for you at the very end. Once you have read this a few times and really have taken the time to understand it I don’t mind if you message me on Instagram or Facebook if you have a question that may help clear all this stuff up.
A quick over view.
French Bulldogs have many colors and color patterns that when mixed together gets you the final color appearance of the dog. Each color and color pattern has its own compartment in the dogs coloring pallet called Locus (meaning Location), each Locus has room for 2 gene variants called Alleles. When these Locus are put together they end up giving you the final coat color of the Dog. Cocoa, Blue, Black, Cream, Fawn, variations of Brindle, Tan and Point and so on…. The lettering that you often see when someone’s trying to portray their specific dogs color DNA in letters is the Locus and Allele. You can look at it like this, a Locus and its Alleles for a blue dog looks like this (d/d). The little d’s are each its own Allele and the parenthesis that hold both Allele together is the Locus. The compartments or Locus are broken down as such: Blue, Cocoa, Testable Chocolate, Cream, Merle, Piebald all have their own locations. Ay(fawn)/At(tan and point)/a(solid black) and AW(sable) share another at the A-Locus. The next locations that shares a location with another Allele is the K-locus (known as the dominant black Locus) and here you have the Ky (allowing gene-more on this later) and the Kbr (brindle) gene.
When you see a big letter and or a little letter in the places where the Alleles are it is telling you if the dog is a carrier or a non-carrier of that specific color trait and a little letter means the dog IS a carrier of that specific color trait. Blue, Cocoa, Cream, AT, a, pied are all recessive genes meaning you need 2 copies to occupy a locus for the color to be expressed in a dogs coat. So blue would be (d/d) and cocoa would be (co/c0). If a dogs only carried 1 copy of the blue gene (D/d) the blue color won’t be expressed in the dogs coat. Merle and Brindle are dominate genes meaning you only need one copy of the gene in its specific location of it to be expressed in the dogs coat.
Below is a quick explanation for most of the Locus (locations) that are in the French Bulldogs coloring panel, that when put together gives your dog its final coat appearance.
K-Locus, also called the dominant black locus. Making Fawn and Brindle French bulldogs
If a dog is brindle it is determined at the K Locus(location). Two sets of Genes can be held here at this location, ‘Ky” and “Kbr”. The “Kbr” gene, also known as the brindle gene, is dominant over the “ky” gene. If a dog carries one copy of brindle it is showed as (kbr/ky) in the K-Locus or two copies(kbr/kbr). If the dog have 1 or 2 copies of the brindle gene the dog will express a brindle coat. The “Ky” gene, its known as the allowing gene. This is because when 2 copies are present it allows the A-Locus, the D-locus and B-locus to determine the dogs coat over all pattern. The “Kbr” brindle gene interferes with the color expression of the A,D and B-locus giving you the brindle look