Tabby british shorthair2/25/2023 ![]() ![]() The bicolour gene is called the White Spotting gene, and is written as 'WS'. If both parents are bi-colour cats, then 75% of their offspring will be bicolours or vans. Therefore, if one parent is a bi-colour cat, then around half of the kittens will be bicolours. The bi-colour gene is a dominant gene in British Shorthair colour genetics. Both parents must carry the colourpoint gene in order to produce any colourpoint offspring. Therefore two colourpoint cats will always produce all colourpoint kittens. A non-colourpoint cat that does not carry the colourpoint gene would be represented as ‘CC’, a non-colourpoint cat carrying the colourpoint gene would be represented ‘Cc’ and a colourpoint cat would be represented as ‘cc’.ĬC = non colourpoint, not carrying colourpoint - none of this cat's offspring will ever be colourpointĬc = non-colourpoint, carrying colourpoint - this cat could produce colourpointed offspring if mated to another cat with the colourpoint gene ![]() Because it is the non-wild type it is written as ‘cc’. It is a recessive gene, so it must be inherited from both parents for a cat to be a colourpoint, and from only one parent to be a carrier. The colourpoint gene was bred into the British Shorthair breed from Siamese and Himalyan cats some time ago. dd = dilute, so the cat would be cream, blue, lilac or fawn and all of the cat's offspring would carry dilute, or be dilute if the other parent carried/was diluteīritish Shorthair patterns The colourpoint gene. ![]() Dd = non=dilute, carrying dilute so the cat woule be red, black, chocolate or cinnamon, but in this case, the cat would be able to have dilute offspring (if the other parent either was dilute or carried dilute).DD = non-dilute, not carrying dilute so the cat would be red, black, chocolate or cinnamon and would never have any offspring that were dilute, even if the other parent was dilute.The same rules of colour dominance apply: blue is dominant to lilac, and lilac is dominant to fawn. If a cat has two dilution genes and is therefore of the genotype ‘dd’, then a red cat will appear cream, a black cat will appear blue, a lilac cat will appear chocolate and a cinnamon cat will appear fawn. One dilution gene does not affect the appearance of the cat, although some breeders suggest that the colour of the cat may be slightly different in some cases, but there is no conclusive explanation for this yet. A cat that is of genotype ‘DD’ or ‘Dd’ will be either red, black, chocolate or cinnamon. The dilution gene is a recessive gene.Ī cat that is DD would be red, black, chocolate or cinnamon. The dilution gene is written as dd, because the wild type of the gene is the non-dilute version, which is written as DD. Whereas a black cat can be a carrier of chocolate or cinnamon, but not both.īoth red and black can be affected by the dilution gene. Cinnamon is absolutely recessive and a cat of a cinnamon phenotype must be of the genotype ‘b1b1’ - if he carried either chocolate or black, he would not be cinnamon in colour.Chocolate is recessive to black but dominant over cinnamon.The first mutation of the black gene created chocolate, which is written as ‘b’ and the second mutation of the black gene created cinnamon, which is written as ‘b1’. The black gene has mutated over the years. Every other colour and pattern is a variation on one of these two original colours. Red or black?Īll British Shorthair cats are either red or black. So black is a capital b - B, and chocolate is a small b - b. The wild type is always written as a capital letter as it is the dominant type. ![]() Black would be the wild type, as would shorthaired. The wild type of the gene is the dominant type - this is the gene that would dominate in the wild.
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