Quote:
Originally Posted by saschia
elf, I agree with you, the color is only one of the problem, but it is the one that can be cleared up relatively easily. If there was mixing, to produce red puppies, at least two mixings (with at least 1 SW) would have to occur. So once is a possibility of accident, but twice... I mean, experienced breeder, especially one with several breeding females and stud dogs, should be able to produce pups of only declared fathers...
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Was there a spesific reason to conclude that there must be more than one mixing taken place?
I'm just wondering, because this does not necessarely have to be the case.
If there is any inbreeding (like in this case there is), then it does not need more than one individual to introduce a new trait (recessive gene) into the lineage/breed. Because due to inbreeding, this one individual may end up appearing in both parent's sides in the pedigree. -And in such situation, the chances are that some day in some certain pairing the recessive gene gets doubled, and so it appears in the phenotype of some offspring.
Of course there CAN be more than one "
oopsie daisy" (a mix up by accident or on purpose) taken place.
But I just wanted to point out, that if suddenly some weird looking puppies of homozygous recessive genotype (like in this case bb / brown coloured) occurs, it may very well be a result of only one "
oopsie daisy" that is just doubled in the pedigree (comes from both parent's sides).
Recessive traits may jump over several generations unnoticed, and it may take time before (due to the chances of random selection of the genes) some day some certain individual will inherit two copies of this recessive gene, that once came from possibly only one certain anchestor who passed it forward over several generations.