![]() ![]() His offspring are unlikely to be especially healthy and he should not be used for stud. If your male calico is the one in 10,000 who happens to be fertile, of course, he should still most definitely be neutered. This produces a tortoiseshell or calico cat with male genitalia. These XXY cats are physically male however, they can have the orange gene on one X and the non-orange gene on the other X chromosome. These cats have a Y chromosome but instead of just one X, they have two. In some rare cases, however, a cat is born with a condition called Klinefelter syndrome. Male cats normally have XY chromosomes and therefore only one of the orange or non-orange genes. For this reason, tortoiseshell and calico cats are almost always female. This means that two X chromosomes are necessary for both genes to be present, otherwise the cat will not have those mottled or patched markings. For a cat to have tortie or calico markings, there needs to be both a copy of the gene for orange fur and the gene for no orange fur. ![]() This mutant gene is carried on the X chromosome. ![]() Calico and tortoiseshell cats have a mutant version of the genes for orange and non-orange colouration, which causes their beautiful mottled and patched coats. The genes that create calico markings are essentially the same as those for tortoiseshell fur, except for an additional expression of the gene for white spotting. Why are calico cats popular? What percentage of calico cats are female?Īll but a tiny fraction of a percent of calico cats are born female.What percentage of calico cats are female?. ![]()
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