A true-breeding organism, sometimes also called a purebred (biology slang: pure line or true-breeding line), is an organism that always passes down certain phenotypic traits (i.e. physically expressed traits) to its offspring of many generations.
What is pure breed and cross breed?
Terminology Pure breeding (straight breeding): the mating of two animals of the same breed; several types. Crossbreeding: is the mating of animals from two or more different breeds.
What is a pure breeding parent?
Supplement. A true breeding is a kind of breeding wherein the parents would produce offspring that would carry the same phenotype. This means that the parents are homozygous for every trait. An example of true breeding is that of the Aberdeen Angus cattle.