It is possible for a male cat to be a calico if it has Klinefelter's syndrome, where it has two X chromosomes and one Y chromosome, though not all cats with Klinefelter's syndrome are calico. The tortoiseshell cat is similar, although on a tortoiseshell cat the spots are usually smaller and closer together and there is less or no white. It is not possible to selectively breed or clone calico cats: an attempt to clone a calico cat will produce a black and white cat or orange and white tabby cat. The layout of the spots is almost random. Whether or not a cat is a calico is determined by genetics, but the actual layout of the spots is not. The white coloring on a calico is from a separate gene unrelated to the orange or black genes. Tortoiseshell cats are not predisposed to gaining weight any more than other cat types, and it mostly comes down to the amount of food they eat, and how much activity they get. Mixed breeds weigh between 5.5-10 pounds with a height of between 8-10 inches. Deactivation of one of the X chromosomes happens in all female mammals. The weight of Tortoiseshell cats depends on the breed. The earlier in development the X chromosomes deactivate, the larger the spots will be. This is what leads to formation of the spots. All cells that were copied from a cell with a deactivated X chromosome will also have the same X chromosome deactivated. ![]() Calico cats are often used as an example in biology classes when discussing sex chromosomes.ĭuring the early stages of development, when the cat is still an embryo, in each cell one of the X chromosomes (either the black one or the orange one) deactivates. A Y chromosome does not have a color gene, so the cat can have either an orange or a black gene, but not both. A male cat usually has one X chromosome and one Y chromosome. However, a female cat has two X chromosomes, so it can have both versions, black on one chromosome and orange on the other, making the cat a calico. A single X chromosome can have either a black allele of the coloration gene or an orange version, but not both.
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