The Savannah Signal Final Issue 2011
www.savannahcatclub.com Basic Savannah Color Genetics, continued The Wide-band gene
I felt it important to at least make mention of the wide band gene, since it is covered in Robinson‘s Genetics. This gene does not have any concrete scientific evidence to support or detail it, but there are several theories. The effect of this gene (or genes) is that it widens the yellowish band on the hair, making for a very small amount of black pig- ment in the tip, and a clear golden ground colour. It has been theorized that the cause of this could be a single dominant (complete or incomplete) gene, or that the maximized agouti protein production is the result of polygenic (more than one gene) fac- tors.
The Codes
Visually, we have four permissible colours for our Savannahs. Genetically, there are nine variations. What a cat can produce has to do with the genes they carry, as well as the genes of the mate.
AAii - This is a Brown(Black) Spotted Tabby that does not carry the Solid allele. This cat can pro- duce Brown(Black) Spotted Tabbies and Silver (Black) Spotted Tabbies.
Aaii - This is a Brown(Black) Spotted Tabby that carries the Solid allele. This cat can produce Brown (Black) Spotted Tabbies, Silver(Black) Spotted Tab- bies, Melanistic and Black Smoke.
Aaii - This is a Melanistic (Solid Black). This cat can produce Brown(Black) Spotted Tabbies, Silver (Black) Spotted Tabbies, Melanistic and Black Smoke.
AAII - This is a Silver(Black) Spotted Tabby that does not carry the Solid allele or the Non-silver al- lele. This cat can only produce Silver(Black) Spot- ted Tabbies, regardless of what other permissible colour/pattern it is bred to.
AaII - This is a Silver(Black) Spotted Tabby that carries the Solid allele but not the Non-silver allele. This cat can produce Silver(Black) Spotted Tabbies and Black Smoke.
AaIi - This is a Silver(Black) Spotted Tabby that carries the Solid allele and the Non-silver allele. This cat can produce Brown(Black) Spotted Tabbies, Silver(Black) Spotted Tabbies, Melanistic and Black Smoke.
AAIi - This is a Silver(Black) Spotted Tabby that carries the Non-silver allele but not the Solid allele. This cat can produce Silver(Black) Spotted Tabbies and Brown (Black) Spotted Tabbies.
aaII - This is a Black Smoke that does not carry the Non-silver allele. This cat can produce Silver (Black) Spotted Tabbies and Black Smoke.
aaIi - This is a Black Smoke that carries the Non- silver allele. This cat can produce Brown(Black) Spotted Tabbies, Silver(Black) Spotted Tabbies, Melanistic and Black Smoke.
What will I get?
Here is a chart showing all nine of the above men- tioned cats bred to each other. Keep in mind the percentages shown are not always the percentage of the kittens in the litter that will have this colour. Usually it does work out this way, but the genetic dice is rolled for each kitten. It all depends on what genes the egg and the sperm is carrying. You could have a 50% chance of getting Brown(Black) Spot- ted Tabbies or Silver(Black) Spotted Tabbies, yet have the entire litter made up of all one colour.
I have colour coded the chart to make it easier to understand at a glance.
A = Tabby a = Solid I = Silver i = Non-silver
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