new to the flock Posted January 24, 2004 Report Share Posted January 24, 2004 Was asked a question about genetic traits (genes) and breeding last night in the PW arms. The question delt with the passing on of good genetic traits through breeding. I am going to try to put up a hypathetical cross between 2 dogs using 6 traits. The six traits are going to be : feet represeted by the letter f nose represented by the letter n muscle structure represented by the letter m bone structure represented by the letter b temperment represented by the letter t eye sight represented by the letter e lower case letters are recessive genes, and come as single recessive or double recessive. upper case letters are dominate genes, and come as single or double dominate. Dog #1 Dog#2 excellent feet .....................FF good feet..........................Ff fair nose............................nN excellent nose...................NN excellent muscle structure...MM excellent muscle structure...MM good bone structure............Bb good bone structure...........Bb Excellent temperment..........TT fair temperment..................tT fair eye sight......................eE fair eye sight......................eE average pup from these two dogs: feet FF x Ff = FF 75 % Ff25% 3/4's of pups excellent feet 1/4 good feet nose nN x NN = nN 25% NN 75% 1/4 of pups fair nose 3/4 of pups excellent nose muscle MM x MM = MM 100% excellent muscle structure. bone Bb x Bb = Bb 100% good bone structure temperment TT x tT = tT 25% TT 75% 1/4 fair temperment 3/4 excellent eyes eE x eE = eE 100% fair eyes If it all came together into one pup (which very seldom happens) you would pick a puppy with: FF excellent feet NN excellent nose structure MM excellent muscle structure Bb good bone structure TT excellent temperment eE fair eyes However you would more than likely end up with a pup having: good feet better than average nose good muscle and skelital stucture a pleasant temperment and an average set of eyes. Things such as cateracts, eye folds, dysplasia, epilepsy are all hereditary traits that become negative dominates -DD if you can assign any of these to a dog you are breeding than take it out of the breeding program. These traits may stay hidden until 2 dogs are crossed that have negative double recessive genes aswell ex. eye folds -ee x -eE would produce 100% bad eyes. always have the eye tests and hip tests performed before breeding, and keep very detailed records. Hope this helped some. Quote Link to comment Share on other sites More sharing options...
Vermin Dropper Posted January 24, 2004 Report Share Posted January 24, 2004 Nicely put NTTF, There is a new section on the UK Kennel Club web site about canine genetics. Quote Link to comment Share on other sites More sharing options...
Teal Posted January 24, 2004 Report Share Posted January 24, 2004 Hi NTTF, for the eyes and bonessurely eE x eE = 25% EE 25% ee 50% eE Bb x Bb = BB 25% bb 25% Bb 50% I realise your instruction is merely hypothetical but I would have thought that temprament of a particular breed of dog has more to do with the way the dog is brought up than the genes it possess's. Quote Link to comment Share on other sites More sharing options...
rabbit hunter Posted January 24, 2004 Report Share Posted January 24, 2004 I have a very basic understanding of genetics. For eg: i will use ferrets skin colour. Polecate colour is PP Albino colour is aa In order to get albino you need to aa. if you had aP, it would be polecat because there is ONE Dominant polecat gene..... am i right?? Quote Link to comment Share on other sites More sharing options...
Teal Posted January 24, 2004 Report Share Posted January 24, 2004 rh for genes which code for the same thing tradition is that the same letter is used and so let a = albino (recessive hence small letter) A = Polecat colouration (dominant hence large) So for your situation if you cross pure breeding Polecat colour with albino: AA x aa = 100% polecat. However, if you don't know if your polecat is pure breeding then it could be that Polecat x albino is: Aa x aa = 50% polecat (Aa) 50% albino (aa) Quote Link to comment Share on other sites More sharing options...
new to the flock Posted January 24, 2004 Author Report Share Posted January 24, 2004 Hi NTTF, for the eyes and bonessurely eE x eE = 25% EE 25% ee 50% eE Bb x Bb = BB 25% bb 25% Bb 50% I realise your instruction is merely hypothetical but I would have thought that temprament of a particular breed of dog has more to do with the way the dog is brought up than the genes it possess's. Will: I was not going to go that indepth into it as than you would have to explain why some are written "aB" and some may be "Ba", was just trying to put a basic clarification across. However you are correct. As for temperment , genetics do play a very large role into an animals behavior. That said so does how an animal is exposed to its enviroment. Which brings us back to genetics versus learned behavior, Nightmare isnt it ....... Quote Link to comment Share on other sites More sharing options...
Yorkshire Pudding Posted January 25, 2004 Report Share Posted January 25, 2004 OOO me poor head !!! glad you posted this one nttf . As an arguement has been running in the Greyhound syndicate ,about which hound we should get . My thoughts were we should go for breeding as we will be more likely to get a open class or a top grade runner . A mate recons that we should just get any old dog and hope it works out. As i tryed to explain to him in my simple/blunt/terse Yorkshire ways " two mingers don't through a supermodel " and " you can't polish a ****" I'm going to proudly go round his house with your "genetics for dummys " thread to see if he can make head or tail of it (lol) in relations to getting a hound ! all the best yis yp Quote Link to comment Share on other sites More sharing options...
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