In order for a cat to have all brown offspring, they need to have the b/b genotype and be a chocolate cat. So, if two cats with this genotype mated, 25% of their kittens could also have the chocolate coloration. The cats with this particular genotype are the ones that are the ones with the special brown chocolate coloration.Ĭats with this genotype are able to transmit their coloration variant to 50% of their offspring. This means that they have the potential to have brown offspring, but also black. However, cats with the genotype B/b do have the recessive brown “b” gene. This means that they are not able to have brown offspring, as they have no way of displaying their brown coloration. Chocolate brown is one of them – it’s “b”.īlack cats will have the genotype B/B. Let’s take a look at the brown variants below to get a better understanding of this. So, the brown color we all love isn’t just a mutation, but it’s rare, and we can understand how it actually works Brown Cat Variants In cats, researchers have “identified two mutations in this gene that cause different variations of brown coat colors in cats.”. The fascinating part? The gene that impacts the production of black pigment is different in different species. The “B” refers to black, but the “b” and “b1” colors are recessive, and are brown variants.Īs such, a reduced amount of eumelanin is required to produce brown cats. Not only that, but they also have the feline primary gene for coat color B/b/b1. So, why exactly are brown cats rare? Well, these cats have a higher prevalence of eumelanin. In these cases, there will be various combinations of the two melanin structures, and coloring can be different. However, there are also cats that have recessive genes. Genes will have a high prevalence of either pheomelanin or eumelanin, which then determines the color of the animal’s coat.Ĭats with genes that have a high prevalence of pheomelanin will probably have red coloring, while ones with eumelanin will most likely be black. This is a type of pigment that has two structural components – pheomelanin (responsible for yellow and red coloring), and eumelanin (responsible for black and brown coloring). Melanin determines the coat color of a cat. The answer is based in science and genetics, just like it is for humans and other living things. No point in diving into the deep end yet, so let’s start with the basics – what determines coat coloring? Understanding What Determines The Coat Color Of A Cat Understanding What Determines The Coat Color Of A Cat.
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