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Originally Posted by FlDebra I think that is still a question that is very much in debate. Sure the present owners/breeders may know that both parents are Yorkies but somewhere back in the line, there could have been a mistake. So, the DNA testing reveals the parents are verified, maybe even the grandparents, but there could be a cross-breeding mistake decades back in the line that is just now surfacing. The DNA testing does not verify that the parents or the grandparents do not have some mixed-genes themselves.
I know from looking at some Yorkies even with traditional colors that there were some mistakes back in the line somewhere. That is why it took me quite a while to find the puppies I did buy. If a Yorkie has a Schnauzer muzzle for instance, chances are great that somewhere, maybe several generations ago, a Schnauzer got into the room when it was not suppose to. Same thing with poodle coats and different body styles. So, it is not a stretch for me to think if the colors are not right (parti), then there was probably a dog with white, allowed to get cozy at the wrong time. Maybe all the puppies looked Yorkie and the breeder decided her planned breeding was all that "took." But somewhere down the line, suddenly white turns up. When it does, no one may even know about the old accident that was the cause.
I follow your genetics example but I don't think that is the way it would work with Yorkie's hair color -- even with my limited H.S. genetics background -- your example would only be for one solid color traits or something like blue eyes vs brown eyes -- not for the variation of color in coats we are talking about. You might want to read the example explaining the piebald traits listed at this site: http://members.aol.com/CYorkie/BiewerTriColor.html -- it seems to be more specific and makes some very clear deductions.
This is very interesting -- I think I could really get into studying the genetics of the breed. Weird, I know! |
Alliec1 is completely correct in her description of how the genetics work. She only used two of the possible colors of course. Since the Parti color shows up occadsionally there have to me more than just the two possibilities.
She just simplified it, because genetics gets very complicated.
No one is arguing that these dogs were derived from a variety of dogs, and I suppose it is possible that some where in it's far distant ancestry that there might have been a small furry white dog of some sort, maybe even a Westie.
But what this thread has concerned itself with is the fact that DNA testing has been done extensively on these dogs back more than one generation.
The breeder that I bought my parti carrier from has champion show dogs, so the AKC knew that the alleged ancestors were yorkies. Champiion yorkies.
Therefore, when they did the DNA testing to see if these offspring indeed did belong to the alleged parents and found out that the DNA matched, then they were certain that the ancestors were yorkies.
To be continued in a new post.................