Tortoiseshell cat

Do you really know about the "tortoiseshell cats"? There are deep things about calico. Tortoiseshell and calico describe a coloring found in cats caused by a combination of specific genetic traits. In the gene of which determine genetic traits of cat's hair color, O-gene that make hair color orange or brown exist on X-chromosome. O and o ⇒ Tortoiseshell and calico. In other words, Each of X-chromosome of calico cat have O or o. However male cats don't have two X-chromosome, they have one X-chromosome and one Y-chromosome. So There are no male and calico cats. But we are find male and calico cats once in a great while. This case these cats have two X-chromosomes and one Y-chromosome. Tortosiseshell Cats are believed to bring good luck in the folklore of many cultures.