Debra, that is not so. I attend many seminars given by well respected geneticists. … The scientific answer is after 5 generations a single outcross event is no longer genetically significant.
Okay let's try math.. although I don't think anyone said you would ONLY outcross once, but let's go for it.
G1: offspring 1/2 outcross
G2: pups carry 1/4 genes
Small but there. And the more closed that non-outcross gene pool is, the more significant that impact can be. Or if the outcross carries a dominant gene that causes some significant change, like your example.
But trait and gene are not the same thing. You can breed that 5th generation to look precisely like the main group, but you did NOT remove the genes entirely.
But we can certainly agree that it takes a lot more than 1 outcross to make much difference.
And when you have a limited gene pool already and then do a lot of line breeding, it gets even more limited.
Although to be honest, having seen a inbreeding coefficient worked on on a Rottie who had NO common ancestors in 4 generations, but more and more the same dogs from 5th to 10, it was frightening to realize how actually limited the genes are in dogs that are seemingly "barely" related.
On to the where the basenji come from… do you really think that most the dogs aren't very closely related and that the different looks expressing conditions/regional selection etc rather than genetics? And if there are dogs who look much more basenji in certain regions, why didn't BCOA limit dogs to those from those areas?
I like you duck/goose analogy, btw. Because when I looked at some of those show pics, I thought they looked Basenji-ish, but not truly Basenji. Yet how many generations would it take to make them look Basenji and isn't the gene pool issue worth that effort? Or would they be so little used it wouldn't help as someone pointed out (you?)?
Great post Nemo, but why not, then, fund a big project to bring in as many as we possibly can while there are hopes for getting as many left as possible? And of course, that goes back to my original question for breeders about the health of the breed and if bringing in more dogs is helpful. Because I really don't know. Yet what rings in my head is the comment to new people posting for the newbie to tell where they got their dog from as most here are related. It really is truer than seems comfortable to me.