breeding true

an organism that is not genetically variable for a particular character. Thus, crossing two parents (or self-pollinating one parent) of this type would produce offspring that were all identical with the parents. Such types are also known as ‘pure-breeding’ and were, for example, used by MENDEL in his experiments with the garden pea. In more precise terms, parents breed true when they are homozygous (see HOMOZYGOTE for a pair of ALLELES of a particular gene.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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References in periodicals archive

In addition to not breeding true, the hybrid breeds are weaker in the areas of longevity, and resistance to disease.

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Heirlooms are open-pollinated, meaning they can self-pollinate and produce offspring that are roughly identical to the parent plants--what seed collectors call "breeding true." Hybrids, on the other hand, are the result of a deliberate crossbreeding of two different parents.

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This seems to be breeding true for the NIF/NCP regime and its supporters.

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Breeding true means that the offspring will almost always possess the same characteristics as the parents.

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When its researchers are satisfied that a germ plasm line is breeding true, they offer the variety to nurseries and breeders free of charge.

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Since each strand of chinchilla hair is ringed with three different colors which must conform to a certain sequence, breeding true chinchilla coloring into rabbits is difficult, as anyone knows who has tried to develop the pattern in other breeds (the more common colors, steel and gray agouti, are sometimes confused with chinchilla).

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