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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.
A crossbred (or crossbreed) dog is what you get when you breed one purebred dog to another purebred dog of a different breed. For example, a Golden Retriever crossed with a Standard Poodle, produces crossbred offspring, like the Goldendoodle to the right. Some people call them hybrid dogs, but that's wrong.A hybrid is the offspring of two different species.For example, a horse bred to a donkey produces hybrid offspring (we call it a mule). But dog breeds are NOT different species. Breed is simply the term we use for an inbred group of dogs within the same species, canis lupus familiaris.Crossing breeds does not produce hybrids. hybrid is the offspring of two different species. For example, a horse bred to a donkey produces hybrid offspring (we call it a mule). But dog breeds are NOT different species. Breed is simply the term we use for an inbred group of dogs within the same species, canis lupus familiaris.