So a chihuahua with a great dane 3 gens back in the pedigree is a purebred chichuahua because it has no resemblace to a great dane?
Why are the rules different for chickens?
I would say a "sport' (genetic mutation) from a purebred line is a purebred. But this doesn't sound like a sport.
Dogs carry pieces of DNA called tandem repeats. Tandem repeats are sections of DNA that repeat themselves and are found in genes. The tandem repeats are prone to mutations because of slipped-strand mispairing during DNA replication. The DNA does not line up properly ( after replication) and when enzymes attempt to correct the mistake a mutation occurs ( within germ cells).
Research has found 37 different tandem repeats in 17 genes that deal with dog morphology. Some of the differences in dogs are found in these genes.
When you talk dogs and chickens, you are talking apples and oranges.
A chicken is a chicken. All chickens share certain genes that make them chickens- some people are all high falutin and have there nose in the air because their birds are from certain line or blah, blah, blah. I approach this according to the standard of perfection- if one bird meets the standard of perfection and another bird gets the same score- they are both the same in my eyes and according to the judge.
The standard calls for specific traits and not if a bird is from a specific line or from a certain breeder. For a bird to have the traits- it has to have a specific genotype. As long as the bird has the genotype (certain genes) it is purebred and it makes no difference what breed was used to make the bird. I could take a male rhode island red and cross that with a female barred rock and in a few generations have a bird that is a delaware. See picture below. The males needed some more work to get rid of the smut.
Now I know all you delaware people are going to pic apart all the problems with the birds and that is fine but the hen is a Delaware. The males needed some work- once the smut is gone they would be a good.
Please, only point out any faults that would disqualify the female. She does have two legs- it just appears that she has only one.
Edited by tadkerson - 10/26/11 at 6:08am