The patching with white colour, caused by gene S, is called Piebald Spotting.
Piebald: Basic white pattern with areas of color.
Pinking up: Nipples turn pink if the cat is pregnant about three weeks after mating.
Piebald: Covered with patches of two colors, typically black and white.
Pigment: A substance, such as chlorophyll or melanin, that produces a characteristic color in plant or animal tissue.
Piebald cats are colored black and white, often haphazardly and with fascinating results. ... Messy Beast: Beautiful Bicolours - Tuxedo and Magpie...
What Types of Cats Have Blue Eyes?
Piebald: specifically black and white, but also applied to white spotting with other colors
Pigment: coloring matter ...
The piebald spotting gene (called partial “leucism') appears in other species like the horse and ball python. It also shows up in the common house cat, and other breeds of cat.
Three elements make it challenging to breed Snowshoes: the white spotting factor (also called the piebald pattern), which is governed by a dominant gene; the pointed pattern, which is governed by a recessive gene; and the body and head type.
Cats with a van pattern carry a piebald gene, which is the same gene that causes the white color on cats with tuxedo (black with a white belly) or bicolor (a color plus white) patterns.
The coloration of the Turkish Van, which is considered by many to be the original breed to carry the piebald gene, calls for a white, semi-longhaired cat with colored markings restricted primarily to the head and tail.
The Turkish van carries the piebald gene which calls for a white, semi-longhaired cat with coloured markings restricted primarily to the head and tail. Turkish vans have a very unique cashmere-like texture to their coat that makes it water-resistant.
Van Pattern is also called Grade 8 - Grade 9 Piebald. It is the most extreme of the 'Seychelles' patterns, comprising patches on head at base of each ear; tail same colour as patches, ...
A seperate gene for piebald patches which is not related to the sex of the cat creates the white areas to make a calico. The male calico cat actually has a rare condition called Klinefelter's syndrome, which alters the chromosomes.
This trait may be governed by the piebald gene as well, or may be governed by a recessive żglovingż (g) gene. Either way, this trait is also difficult to control.
The Turkish Van is considered by many to be the original breed to carry the piebald gene; because of this, other piebald cats are said to be “van-patterned' after the breed that originally sported it ...
Bi-color cats are an expression of the piebald spotting gene and this gene had, and continues to have, a high distribution in the eastern feline populations.
This gene is not completely understood, yet geneticists believe it is recessive and unrelated to the more common dominant "piebald" or white spotted factor gene. Both parents must carry the recessive gloving gene to produce kittens with white gloves.
Black and white bicolor cats have also been known as piebald, pied, parti-colored and even magpie cats, although these expressions are not much used nowadays. Jellicle cat is another term, made popular by T.S. Elliot, that is often applied to tuxedos.
The bicolor patten is created by the addition of a piebald gene to any of the other accepted colors/patterns. The cat will have white on its belly, legs,and an inverted V on the face.
 Oriental Shorthair varieties
Ebony White Bicolor male ...
It is referred to a a piebald cat. The coat has a cashmere texture and does not have an undercoat. The coat is also water resistant which goes hand in hand with one of their personality traits of having a fascination with water.
They are noted for the colouring, with a piebald tail and head of red, cream, black, blue, tabby, tortoiseshell, dilute tortoiseshell (also known as blue-cream), brown, blue, with their body being predominantly( at least 80%) white.
These cats come in varying colors. Most common are black, white, blue, smoke, brown tabby, silver tabby, color point, red, and recently, piebalds.
The Van pattern is governed by the dominant white spotting factor piebald gene (S), which gives them patches of white along with spots of color.
See also: Turkish Van, Spotting, Turkish Angora, White spotting, Champion