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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.
An organism with two alleles for a trait that are exactly the same is called homozygous (HO muh Zi gus). An organism with two different alleles for a trait is called heterozygous (HET uh roh Zi gus). Pure Traits. Pure traits can be either recessive or dominant. A pea plant with one recessive gene for shortness and one dominant gene for tallness is a hybrid for that trait. A hybrid is called heterozygous, as it has two different alleles. The offspring from a pure tall pea plant, cross-pollinated with a pure short pea plant, will result in a heterozygous plant for tallness.