True breeding organism
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A true breeding organism is an organism having a certain trait which is passed on to all subsequent generations when bred with another true breeding organism for the same trait.
To "breed true" means that if two organisms with a particular, heritable phenotype breed, they will produce offspring of the same phenotype.
Refers to plants that produce offspring of the same variety when they self-pollinate. For example, when a true-breeding plant with pink flowers is self-pollinated, all its seeds will only produce plants that also have pink flowers. Gregor Mendel cross-pollinated true-breeding peas in his experiments on patterns of inheritance of traits.
The genotype, in case of a gene where one allele is recessive and another dominant a true breeding organism would be homozygous to the allele corresponding to the phenotype.
