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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.
Bacteria in nature do not exist as pure cultures like the ones that we have used in. lab. Instead, they are found in mixed populations with many other species. To accurately. examine the characteristics of an individual species, the species must be isolated from the. rest of the population.