Hi! welcome to the genetic series once again! Today we deal with cats of the color that hardly anyone knows about their existence and there is a very specific reason for this. It is not enough that the fawn color arises from the action of two locuses, it’s still to get a cat in this color we need to bypass all dominant genes falling into both of these locus. Locus, to put it simply, is a container for gen. The first stage in the formation of a fawn color is the same as this one which we already know from the previous episode – about cats in cinnamon color. The genes that are responsible for the shape and size of the black pigment granules fall into the “B” gene container. The dominant gene, the large “B”, causes the particles to have normal shape and size so they adhere tightly to each other, making the hair uniformly black, and look like this under a microscope: However, if two recessive genes fall into the container for these genes, the small “b” genes they reduce and distort the granules as a result, the hair color brightens to a brown color called chocolate. However, we are interested today in a combination of even rarer genes, because they are recessive in relation to both large “B” and small “b”. This gene is a small “bl” and it is the combination of two such genes that makes that the particles become even smaller and even more distorted, as a result, the pigment granules do not adhere to each other the hair under the microscope has an uneven color with a warm tone and looks like this: And thanks to this, when we look at the cat, we can see light brown hair called cinnamon. And only on the basis of such a color can we obtain a fawn color and this happens with the help of the container for “D” genes. Just like genes falling into the “B” gene container are responsible for the shape and size of pigment granules, those from container “D” are responsible for its thickening in the hair. Dominant genes, large D – are responsible for the normal concentration of color. If a cat inherits at least one large D gene from one of its parents, nothing happens the color obtained with the “B” container does not change. However, if a cat inherits two small “d” recessive genes, the density of the pigment in the hair decreases drastically, and as a result the color of the coat brightens. Black brightens to blue, chocolate to lilac, and cinnamon to fawn. So we can get a fawn cat only with one single combination of genes, and they are all recessive. If you want to figure out from which mating you can get such a cat just to remind you at the top and bottom I will give you a link to the instructions for using the genetic square. Although the fawn color was introduced into the Ragdoll breed with cinnamon so already around 2010 it’s similar to cinnamon cats that we still do not find a fawn description in the standards for Ragdoll cats of any organization associated in the WCC. Who will describe it first? I am very curious and I will update you if anything changes. Meanwhile, I was able to gather a few photos of cats of this color in a film, to which you can find the link at the top and bottom. That’s all for today, see you next time!