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Cocker Spaniel Coat Color Inheritance

Roan

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K Gene Dominant Black BlackBrown RecessiveBlack BlackTanSable Sable bred Buff Blue Buff Chinchilla Parti Roan Progression of Roan Ticking Inheritance Interactive Genes All-White Spots
THE ROAN GENE IN COCKERS
The R gene - The R gene is known as roan. 
It is a simple dominant
which means either you have it or you don't. 
You can only get roan puppies if one parent is roan. 
The roan gene is expressed (seen)only in the white areas of spotted dogs 
(in our experience). 
The roan genes works like this:

R - dominate to r, produces roan

r - recessive to R,meaning if you don't have it
you can't produce it .

Roan and Merle inheritance compared

ROAN DOES NOT SPONTANEOUSLY COME FROM A BREEDING OF TWO NON ROAN PARENTS
There seems to be a very wide spread misconception about the inheritance of roan as to whether it grades in to the ticking gene!
The concept is being fostered by experts that either do not breed cockers and are quoting other experts (who usually are quoting other experts) or by breeders passing heavily ticked cockers off as roan.
There is some evidence of roan  being visible on a solid colored cocker 
when it is  homozygous( R R ) . 
If you want to see that the roan gene has nothing to do with the ticking gene look at PROGRESSION OF ROAN it is a documentation in pictures of a roan cocker that has no ticking or anything that resembles ticking!!!!
Gary
Pages:
Roan:
chart 1 chart 2 chart 3 chart 4 chart 5 chart 6 Roan v Merle Progression of Roan in Pictures
 
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This page was last modified on: Friday, 14-Mar-2008 21:06:02 PDT.