Cat Coats White

white cat
White Cat Photograph copyright Hilali

Cat coats white is the last in a series on the cat coats. See all the articles by clicking on this link.

In previous articles I have mentioned the Piebald gene (White Spotting gene). The gene usually (denoted by the letter "S") produces coats with white "spots" although "spotswhite cat" is a misleading term. It produces areas of white leaving other areas in a wide range of colors and patterns such as Tuxedo, Tabby, solid colors and others (it is perhaps best to see all the posting to get the complete picture).

As can be expected if the White Spotting works to maximum effect then the whole of the cat will be white instead of areas of white, either small or large. Accordingly, one of the three genes that produces all white cats is the White Spotting gene. It's actions are wide ranging as can be seen. That's why it is said to have "variable expression". It is called "recessive white" sometimes and I suppose because of its variable actions, it is "semi-dominant".

The genes that produce white fur cover up the other colors. Note: Albino cats are due to a different effect, the lack of production of color (see below).

white cat
White cat on balcony copyright G rome

The other gene that produces cat coats that are white is the Dominant White gene ("W"). This gene masks all other colors. As a result it is impossible by looking at the cat to see what other genes are present. To use technical language, the gene W is "epistatic" meaning it masks all other color genes. There may be an exception in relation to eye color.

The dominant white gene is a simple non sex related dominant gene. The white cat is not due to the presence of a number of piebald (white spotting) genes. The W gene is at a different position on the chromosome to the white spotting gene and is therefore independent of the white spotting gene.

Epistatic crudely means that where there is a competition between genes as to what color or type of coat will be seen (for genes involved with coat color), the gene whose phenotype (the appearance) is expressed (the appearance seen) is said to be epistatic.


white cat Turkish Angora cat
Cat coats white - Turkish Angora cat - photo copyright Helmi Flick


The W gene is also associated with deafness as it can affect the cochlea in the inner ear (the fluid filled chamber that converts sound waves to nerve transmissions to the brain). The gene produces blue, orange or odd eyes. If the cat has blue eyes there is a good chance that he/she will be deaf as well. If she has one blue eye, there is a good chance that she will be deaf in the ear on the side of the blue eye. As the name of the gene implies this is a dominant gene so if fully present its effects are produced (from genotype - the genetics to phenotype - the physical result).

In a survey of 185 cats, one quarter had normal hearing and yellow eyes, 31% had normal hearing and blue eyes, 7% were deaf and had yellow eyes and 37% were deaf and had blue eyes.

The third and highly unusual genetic make up that results in all-white cat coats is the albino. This is complicated genetically so a brief mention is probably best. There are alleles that are known to produce albinoism. An allele is one member of a pair of genes at a certain point on the chromosome. The alleles concerned are blue-eyes albino, pink eyes albino, Burmese Pattern, Siamese Pattern and full color (ref: Sarah Hartwell). These cats have pink eyes.

The all white cat is more prone to contract skin cancer as the skin more readily absorbs ultraviolet light. This should be born in mind by keepers of white cats in hot climates.

Source:
  • Messybeast
  • Robinson's Genetics
  • Me
Photograph of White cat on green background (middle) is copyright Helmi Flick.

From Cat Coats White to Home Page
Cat Coats White Cat Coats White Reviewed by Michael Broad on February 23, 2008 Rating: 5

No comments:

Powered by Blogger.