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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.
Species. A species is a group of organisms that can interbreed to produce fertile offspring. Individuals of the same species have more characteristics in common than they do with organisms of a different species.Sometimes a species may have different kinds or breeds that show great variation, but the individuals still belong to the same species. Different breeds of pedigree dog are like this.t can be difficult to classify some organisms into species. For example, evolution is a continuing process. Some organisms can only reproduce asexually, while some species can interbreed to produce hybrids. For example the liger is a hybrid cross between a male lion and a female tiger.