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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.
The highest rank (most inclusive) was given to kingdom, followed subsequently by phylum, class, order, family, genus, and species. Species was Linnaeusâs least inclusive level of classification and includes all organisms of similar morphologies that can interbreed and produce viable offspring.Given the vast scope of his work, Linnaeus completely ignored classifying single-celled organisms.pecies was Linnaeusâs least inclusive level of classification and includes all organisms of similar morphologies that can interbreed and produce viable offspring. Given the vast scope of his work, Linnaeus completely ignored classifying single-celled organisms.