Understanding genetics and contribution from dogs long gone - Page 2

Sun, it´s called Meiosis

meiosis is two part process operate on chromosome for each replikation. so cannot say that breeding result in loss of half genetics for litter only puppy. different offspringer have different result from process. not all puppy same if not cloning. is possible, but not likelihood, litter as popolation preserve all genetic asset from both parent if puppies number greater one. except father mitocondrial dna. but new works thinks maybe not all loss also.

Fring, I guess we talk about single individuals, not whole populations.
The more offspring, the bigger the chance to reproduce everything, sure, but unfortunately not within one individuum.
As far as I know breeders only tend to use one male and one female for breeding. ..

if litter one puppy only, yes, lose 1/2. if litter bigger, not necessary and not liklihood lose 1/2. is population of litter, that matter. you said:

Looking at genetics there always will be a loss of 50% of genetic material within ONE generation ( DNA; 50% dam - 50% sire ), everything else is impossible. That´s no guess, that´s science.

this possible but meiosis not predicate and not predict. you very wrong about fundamental and now you make track back and be sarcastic but that not change scientific proof. also, 50/50 not right for mammal. that mendel, single cell organism theory not transfer to multifactor genetic of canine.

Dogs long gone are dead. The contributions of their offspring are the results of what their offspring do .. this thread is like giving a 3 year old a box of fresh Krayons and a nice clean white wall .. most of these supposedly legendary dogs had most offspring that were or are unremarkable while the few that were remarkable are or were remarkable in ways that had nothing to do with their famous sire or dam. So long as the deck gets reshuffled every so often someone gets an ace high straight flush but one may get a heart flush and anther a spade flush. If you don't reshuffle the deck someone gets a pair of twos or worse. Most dogs are a lot like the sire and dam regardless of their great, greats, or grey wolf ancestors.

Sorry, I really didn't want to sound sarcastic.

"If litter one puppy only, yes, loose 1/2. " 

That's what I tried to express, nothing else, the genetically contribution of sire/dam within one son/daughter.

In case you want to get it all, you need to clone, at least that's my amateurish understanding of genetics.

 

Susie, I am considering the whole genome, not just a single individual. When breeding dogs, you have to think about stuff like that. For instance, Star has Palme 14 times in 7 generations: should I breed her to another showline dog that has the same genetics?* What would have happened if her parents had both been German showlines, heavily line bred on the same dogs? In a closed gene pool,which is what you have when dealing with purebred dogs, there are only so many ways the genetic deck can be reshuffled. The split between show line and working line has narrowed the gene pool even further...heaven forbid I should get 'shit on my gold' by outcrossing to a working line dog! 

 

(* I am speaking of a hypothetical breeding, of course - Star is not only spayed, she is also now 9 years old.)

This conversation is of particular interest to me and the one question that comes to mind is what is a German Shepherd lover to do? The science is showing what owners have experienced and perhaps many breeders have known..............problems in the breed can be, have been, and are being magnified. What should a dog buyer do who wants to have some assurance of a healthy pet? What should breeders be doing to help insure the breed lines produce the healthiest offspring knowing the gene history? And how can the responsible German Shepherd lover hook up with the responsible breeder who takes heart in the science?

Ickw, first of all, sorry for your loss...

Curious as I am I tried to find out more about your dog, and I found a Shih Tsu, and a comment about a dog named "Blade". Something seems to be totally scewed up ...

About your search for a puppy:

In the US breeders normally do warrant hips and elbows, sometimes ears, testicles and teeth.
Statistically these are the main problems in the breed, everything else may happen, but statistically it´s bad luck.

Personally I´d go with a breeder training and titling his own stock ( Bullinger Shepherds was a very good advice ), at least these breeders stick to the SV rules ( HD/ED, titles, show rating ), and I tend to take a look at the siblings of sire and dam ( HD/ED results ), and at the lifespan of the direct ancestors ( 2. generation ). I also ask about bloat, for me the tendency to bloat is inheritent ( not prooven, just my opinion ).

In case you do have the ability to visit a dog sport club, do it. There you will have the opportunity to see at least the potential dam, in the best case the sire and some offspring, too.

Otherwise puppies are just puppies, even the best breeder will produce a unhealthy puppy once in a while, that´s nature.
Humans can do there best, but sometimes nature is against you.

Good luck!