|Cat Coats Solid and White - Bicolor|
photo copyright fofurasfelinas
This is another posting on cat coats. This time I discuss the impact of the white spotting gene on "solid" colored cats other than Tuxedo cats, which I have already discussed on this page. Tuxedo cats are very common and specific in their coat pattern so I dealt with them separately. Both are bicolor cats meaning a cat coat of two colours, white and another solid colour.
The particular effect that the white spotting gene has on any one cat dictates the spread of white fur on the cat (or put it another way it restricts the spread of color). The cat fancy has given names to the patterns caused by this gene, which by the way is also called the piebald gene. It is considered a "semi-dominant" gene.
White spotted cats are one of the most common cats. The white spotting gene (represented by the letter "S" in the science of genetics) can change the appearance of any colored cat including tabby cats or tortoiseshell cats or a combination of the two (torbie). [See cat coats tortie and white]. When it affects a tortoiseshell cat the cat is called a Calico cat in the States.
A fine example of a cat with a solid and white coat is the Turkish Van (high grade spotting - see below). This has, of course, the "Van" pattern. Van is a town in the South east of Turkey, where the Turkish Van originally came from (including adjacent regions).
Another example of a well known cat breed with a "solid and white coat" is the Japanese Bobtail. The Japanese Bobtail has a Bicolor pattern in both "solid and white" and calico (which is tortoiseshell and white mentioned above).
Bicolor cat photo by tanakawho (this photographer is well known -see more of his work here plus the work of 2 other fine photographers). Picture reproduced here under a creative commons license.
I discuss, in brief, the workings of the piebald gene on the Tuxedo cat page as well as here. The effects of the piebald gene can be seen to varying degrees. The amount of white dictates whether the pattern is a grade 9 (almost total white with the colored fur limited to a few spots). This is called high grade spotting.
At the other end of the spectrum at grade 1 there is a very small amount of white. This is called low grade spotting. When the cat is low grade the genotype (genetic makeup in relation to the cat's coat) is normally heterozygous represented by the letters "Ss". Conversely when the coat is high grade (lots of white) a spotted cat is generally homozygous "SS".
The presence of the piebald gene results in white fur by causing special embryonic cells to behave in a defective manner. These cells are called "Melanoblasts" and they become the cells of the cats body that produce the granules of pigmentation that are embedded in the individual hairs. During the embryonic stage these cells migrate from the spine area. They fail to migrate properly and fully causing parts of the body to be without color. The wide variability of the effect of this gene is due, at least in part, to the presence of other unidentified genes called "polygenes".
Here are some photographs of the solid and white coat pattern:
|Cream and white - photo:|
copyright Helmi Flick
Cat Coats Solid and White - Turkish Van - Photograph copyright Lazy_Lightning
Cat Coats Solid and White - Black and White Van pattern with a lot of white (grade 8 perhaps) - photograph copyright Helmi Flick.
Black with white (more than a Tuxedo). Photograph copyright Helmi Flick.
Cat Coats Solid and White - This is another Black and White cat (hairless cat). This demonstrates how the white spotting gene affects the skin color as well. Perhaps a more accurate description for this cat, a Sphynx Cat (or Sphynx-like cat) would be Black and Pink! Photograph copyright Helmi Flick.
Cat Coats Solid and White - Sources:
- Beth Hicks
- Messybeast - Sarah Hartwell
From Cat Coats Solid and White to Cat Facts