Is roached back a dominant shape - German Shepherd Dog Forums
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post #1 of 18 (permalink) Old 12-27-2014, 12:09 PM Thread Starter
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Is roached back a dominant shape

If a roached back and straight back are bred together, how does the genetics effect the progeny. Is it fifty fifty chance that a pup from that combination will be of either type? Or is it that one of these types is more dominant?
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post #2 of 18 (permalink) Old 12-27-2014, 02:26 PM
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I think nature will normalize the built if it can. Just my non-science-based opinion.
You cross a Pug with a normal nosed dog and the pups have functional noses.
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post #3 of 18 (permalink) Old 12-27-2014, 02:40 PM
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I think nature will normalize the built if it can. Just my non-science-based opinion.
You cross a Pug with a normal nosed dog and the pups have functional noses.

Hmmm...that doesn't explain why English Bulldogs have to have c-sections because of human interference in physical structure.




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post #4 of 18 (permalink) Old 12-27-2014, 02:41 PM
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Originally Posted by TEZPUR1976 View Post
If a roached back and straight back are bred together, how does the genetics effect the progeny. Is it fifty fifty chance that a pup from that combination will be of either type? Or is it that one of these types is more dominant?
Ash always explains this very well. I hope she sees the thread.




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post #5 of 18 (permalink) Old 12-27-2014, 02:43 PM
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Good question!Now I'll have do some research and see I can find out!
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post #6 of 18 (permalink) Old 12-27-2014, 03:37 PM
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Hmmm...that doesn't explain why English Bulldogs have to have c-sections because of human interference in physical structure.
Because they didn't give nature the chance to normalize them by breeding dysfunctional traits to each other and let these win in the show ring.
Breeders have a hard time retaining these sad shaped faces (that's what one of those breeders told me, except the word "sad").
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post #7 of 18 (permalink) Old 12-27-2014, 03:50 PM
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I understand why the bulldogs are what they are. Thanks though.




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post #8 of 18 (permalink) Old 12-27-2014, 04:06 PM
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I tested a show line litter yesterday. The mother has a very moderate structure and top line. The sire more of the common type. Some of the pups have his top line and some were like mom. One of the puppies was very nice at testing, but has her dad's top line. I kept telling the breeder, love her temperament, hate her top line. Anyhow, breeding a more moderate dog can give one some more moderate pups.

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post #9 of 18 (permalink) Old 12-27-2014, 09:25 PM Thread Starter
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"...The sire more of the common type."

Do u mean the sire has sloped back as in a showline dog?

Ur observation is in line with my guess.

If we relate with Mendel's pea plant expt, say R =roached back
S=Straight back

Suppose the sire is SS and dam RR, then a pup will be of the type SR (am i correct)?

The phenotype of SR is likely to be moderately roached ?

I think the case

"... The mother has a very moderate structure and top line. The sire more of the common type..."

refers to SR bred with RR. The a pup has 3/4 chance of being SR (moderately roached) and 1/4 chance of RR Roached back type.

This perhaps explains the observation

"...Some of the pups have his top line and some were like mom..."


Of course I am assuming in SR , some amount (even if very mild) of roach will be present in the phenotype.



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Quote:
Originally Posted by lhczth View Post
I tested a show line litter yesterday. The mother has a very moderate structure and top line. The sire more of the common type. Some of the pups have his top line and some were like mom. One of the puppies was very nice at testing, but has her dad's top line. I kept telling the breeder, love her temperament, hate her top line. Anyhow, breeding a more moderate dog can give one some more moderate pups.
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post #10 of 18 (permalink) Old 12-28-2014, 02:16 AM
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I have no experience with this specific genetic example, but the likelihood that the "roach back" is one gene is slim to none scientifically. The classic Mendel's pea plants example is very basic genetics and deals with a trait in which phenotype is based on one gene and thus genotype can be inferred from mere observation. Most physical traits are not anywhere near this basic. Many genes are at play and how they combine is very hard to determine and predict.

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