Quote:
Originally Posted by Mike1975  Recently I read Ann Seranne's book "The Joy of breeding your own show dog" where she writes about the " recessive “blue” silky coat".
Are we dealing with recessive here?
Because if we did, it would be easier for breeders to lock this trait in their lines.
Instead, breeding together 2 dark blue silky coats, the resulting pups are not always dark blue!
And this is easily explainable if we consider only the Graying Gene effect.
According to our knowledge for Graying Gene "anecdotal" principles, a dark steel blue dog must be Gg in G locus.
This simply means that the elusive DARK STEEL BLUE is a result of heterozygosity. 
So breeding together with another Gg dog, the resulting pups will have 50% chances to be Gg, 25% to be GG (silvery color) and 25% to be gg (black).
To add (again  ) more confusion
Quoted from Yorky Club Magazine - United by passion for Yorkies. **
Let assume that a black bitch is gg, and a silver dog is GG. Bred together, ALL the resultant puppies will be Gg...
Hmmm  |
Part of the problem could be with terms. What one person might consider "blue" might not be what someone else considers "blue." And there is a recessive "blue" allele at the D locus that results in the "blue born." I agree with the conclusion of the person you quoted, "There [are] not enough puppies to draw the correct conclusion." What is really needed to figure this all out is a database of standardized photos (taken under the same lighting conditions, dogs of the same age, etc.) of dogs and their parents, taken at various stages in their development. An experienced canine coat color geneticist needs to look over all of these data and perform a meta-study. Unless the same pair is bred over and over again, litters are too small to draw any more than anecdotal information, and that seems to be all we've got. The G locus is barely in the scientific literature at all, and the V (Silver) locus, which may or may not be the same as the G locus, has even less information in the literature.