
This is a placeholder text
Group text
by singe on 17 June 2008 - 23:06
please can someone clarify whether litter siblings carry the same gene make-up, ie if a female has proven she carries the long coat gene, does it mean her litter brother also HAS to carry the gene? be gratefull of any explanations, I understand about its recessive nature , its the sibling bit I'm not sure about.

by Mystere on 17 June 2008 - 23:06
The sibling may or may NOT carry the gene. It depends on what he received from each parent. Was either of the parents a long-coat? I
by singe on 17 June 2008 - 23:06
Neither of the parents were long coats & all the litter where short coated.

by pod on 18 June 2008 - 00:06
There are two possibities for the parental genotypes in this case. The most likely (assuming the litter was of normal size ie over 4) is that just one parent carried longcoat, in which case the litter brother has a 50% chance of carrying.
Less likely but still possible, is that both parents are carriers, in which case the litter brother has a 67% chance of carrying.
NB. This is discounting the influence of modifying genes which can alter the phenotype to give the impression of longcoat in a carrier.

by katjo74 on 18 June 2008 - 00:06
If a full litterbrother was produced in the litter that was long-coat, then both parents are carriers, whether their coats are super-short or plush.
The long-coat gene is a homozygous recessive condition just like the coat color black. This means the puppy/dog has to inherit that recessive gene from BOTH parents in order to be produced with the coat/color.
This means, your puppy from the same litter has:
25% chance(1 outta 4) of NOT being long-coated nor a long-coat gene carrier
50% chance(2 outta 4) of NOT being long-coated but IS a carrier(meaning, if this normal coated dog is bred to another normal coated carrier dog, then you could see a long-coated pup now and then)
25% chance(1 outta 4) of BEING long-coated.
That's as simple as I can possibly explain it. The greatest chance via Mendelian genetics is that your pup is normal but is a carrier of the gene. Dunno how else you could find out if he/she is a carrier or not unless you bred to check for it.
by Blitzen on 18 June 2008 - 01:06
Singe, log on to the following site and read all about longcoats in the GSD. There is now a DNA test that will tell you if your dog carries the gene recessively. As Katjo el al have already stated, both parents of a long coat must be carriers and the odds are about 25 % that your dog is not a longcoat or does not carry the gene recessively. Not all longcoats have a hair to the floor, some will pass for plushes. The length of the coat is determined by the modifiers. The modifiers tell the coat when to stop growing.

by katjo74 on 18 June 2008 - 01:06
Good point, Blitzen-there ARE many different variations/degrees of length of a "long-coat"-too many to try to explain and describe.
by Blitzen on 18 June 2008 - 02:06
Katjo, I wouldn't be at all surprised if some of the dogs we think of as plushes would test positive for being genetic long coats.

by katjo74 on 18 June 2008 - 04:06
LOL-that's nice, eh? lol. You could be right with that.
Oh well-I think in the long run, better to produce a long-coat where the 'defect' is merely cosmetic rather than a cryptorchid or mega-E pup, or etc...it's a matter of perspective.

by Silbersee on 18 June 2008 - 13:06
Long stock coat or not will only matter to the breeder or owner to make sure which variety class at a show he or she enters in, since long stock coats (those with an undercoat) will now be reinstated and the FCI standard is in the process of being changed. This was voted on two and a half weeks ago in Kassel at the BV (General Assembly). I thought that I mention that since it did not seem to have made its rounds here at the PDB.
Contact information Disclaimer Privacy Statement Copyright Information Terms of Service Cookie policy ↑ Back to top