![]() ![]() As males (XY) only have one X chromosome, they can portray either black or orange, but not both. As females (XX) have two X chromosomes, they can portray two colors at the same time (black and orange). The reason why all this is related with tortoiseshell cats is that the gene that codes for orange color is linked to chromosome X. If the sex chromosome X provided by the mother joins the Y chromosome provided by the father: male If the sex chromosome X passed by the mother joins the X chromosome passed by the father: female Sex chromosomes (X) – (Y) define if the new kitten will be a male or a female, but the one provided by the father will be the most relevant, for he´s the one that has the Y chromosome. ![]() Inside those chromosomes there are genes (formed with DNA sections) which determine the genetic heredity. One of the nineteen chromosomes from the mother is the sex chromosome (X), and one of the nineteen chromosomes from the father, is either the sex chromosome (X) or (Y).Ĭhromosomes are structures inside the nucleus of each one of our cells. ![]() When the egg and the sperm join during fertilization, the mother contributes with nineteen chromosomes containing genetic information and the father, contributes with the other nineteen, amounting to a thirty-eight chromosome genotype. Genetics is a very extensive topic, so I will try to summarize some basic concepts that will help understand how it influences the colors of cat coats. How does genetics influence tricolor combinations? Tricolor cats can be present in all breeds of cats as they do not belong to one in particular but for a cat to be considered tricolor, she must have the following combination of three colors: Why are tortoiseshell and calico cats considered to be tricolored? Let´s find out why they are called “tricolor”, how genetics influences their colors and why they are associated with females. In some countries, they are considered to be symbols of good luck, probably because they are not very common. Throughout history, tortoiseshell and calico cats, also known as tricolor cats, have been very special animals. ![]()
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