Hi! Welcome to the next episode of the genetic series, in which I tell how different colors of cats are created, today we will deal with chocolate color. The chocolate color is created in the same locus as the black color, which I have already mentioned in one of the previous episodes, to which I will leave the link above and below. Locus is, to put it simply, a container for gen. To the “b” gene container, that we talk about today, may fall the large “B” gene and he is responsible for the black color, or the small ‘b’ gene, which is responsible for the chocolate color or the small ‘bl’ gene, which is responsible for the cinnamon color. The small “b” we’re dealing with today is recessive to the large “B”, but dominant to the small “bl”. Each cat gets two copies of the b gene, one from each parent. If at least one of these genes is a large “B” that is dominant, the second gene doesn’t matter, the cat will be black anyway and there is no way it will be chocolate. However, if this does not happen, i.e. no large B gene will fall into this container, and the cat will receive at least one small “b” gene from any parent, the cat will be chocolate. So chocolate cats are cats with the “bb” or “bbl” genotype. How to get such a cat from parents whose genotype we know, we can check using a genetic square – instructions for such a crossword can be found in the video to which the link will be at the top and bottom. And if you don’t like crosswords, then you can use the color predictor who Jola Lisiecka prepared for us. Thanks, Jola! How is the coat color chocolate achieved? The genes that have the effect on eumelanin, the black dye, fall into the “b” gene container. The dominant gene, large B, conditions the formation of pigment granules of normal size and oblong shape. On the other hand, the small “b” gene reduces the granules and changes their shape to a spheroid. According to the Polish language dictionary, the spheroid is “an ellipsoid-like rotational surface that reproduces the shape of the Earth.” English Wikipedia proved to be more helpful when comparing this shape to a rugby ball. If you still listen to me carefully, leave the hashtag: rugby in the comments. Changing the shape and size of the pigment granules results in a lighter coat color, instead of a black cat we see a dark brown cat, called a chocolate cat. What a chocolate cat looks like in reality, you can see in the video in which, with invaluable help from other breeders, I collected photos of chocolate Ragdolls in various colors. However, information on how the chocolate Ragdoll should look in theory can be found in the breed standards. I invite you to the channel in a week – I will talk about how the lilac color is made and what it looks like.