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From Wikipedia, the free encyclopedia. A true breeding organism, sometimes also called a purebred, is an organism that always passes down certain phenotypic traits (i.e. physically expressed traits) to its offspring.n organism is referred to as true breeding for each trait to which this applies, and the term true breeding is also used to describe individual genetic traits.
List of Purebred and Hybrid Dog Breeds Discover information on all purebred dog breeds and hybrid dog breeds. Affenpinscher Afghan Hound Ainu Dog Airedale Terrier Akbash Akita Alapaha Blue Blood Bulldog Alaskan Husky Alaskan Klee Kai Alaskan Malamute American Bulldog American Bullnese American Cocker Spaniel American Eskimo Dog American Foxhound American Hairless Terrier American Indian â¦