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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.
Other health problems among purebreds are the product of both inbreeding and bad genetic luck. The genes responsible for many genetic diseases are ârecessive,â which means that two copies of a damaged gene, one from the mother and one from the father, must be present in an individual for the disease to occur.elective breeding of the disproportionately short legs of breeds such as the Basset Hound and the Dachshund has led to bowed legs and chronic problems with elbow dislocation; the short legs and long back of Dachshunds causes them to suffer more often from ruptured vertebral disks.