True breeding organism
Encyclopedia
A true breeding organism, sometimes also called a pure-bred, is an organism
having certain biological traits which are passed on to all subsequent generations when bred with another true breeding organism for the same traits. In other words, to "breed true" means that two organisms with a particular, inheritable phenotype
produce only offspring with that (same) phenotype.
In the case of a gene with multiple different alleles in the population, the genotype of a true breeding organism is homozygous. For example, a pure-bred variety of cat, such as Siamese, only produce kittens with Siamese characteristics because their ancestors were inbred
until they were homozygous for all of the genes that produce the physical characteristics and temperament associated with the Siamese breed.
True breeding is also used to refer to plants that produce only 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 definition of true breeding is : Pertaining to an individual all of whose offspring produced through self fertilization are identical to the parental type. True breeding individuals are homozygous for a given trait.
Organism
In biology, an organism is any contiguous living system . In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole.An organism may either be unicellular or, as in the case of humans, comprise...
having certain biological traits which are passed on to all subsequent generations when bred with another true breeding organism for the same traits. In other words, to "breed true" means that two organisms with a particular, inheritable phenotype
Phenotype
A phenotype is an organism's observable characteristics or traits: such as its morphology, development, biochemical or physiological properties, behavior, and products of behavior...
produce only offspring with that (same) phenotype.
In the case of a gene with multiple different alleles in the population, the genotype of a true breeding organism is homozygous. For example, a pure-bred variety of cat, such as Siamese, only produce kittens with Siamese characteristics because their ancestors were inbred
Inbreeding
Inbreeding is the reproduction from the mating of two genetically related parents. Inbreeding results in increased homozygosity, which can increase the chances of offspring being affected by recessive or deleterious traits. This generally leads to a decreased fitness of a population, which is...
until they were homozygous for all of the genes that produce the physical characteristics and temperament associated with the Siamese breed.
True breeding is also used to refer to plants that produce only 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
Gregor Mendel
Gregor Johann Mendel was an Austrian scientist and Augustinian friar who gained posthumous fame as the founder of the new science of genetics. Mendel demonstrated that the inheritance of certain traits in pea plants follows particular patterns, now referred to as the laws of Mendelian inheritance...
cross-pollinated true-breeding peas in his experiments on patterns of inheritance of traits.
The definition of true breeding is : Pertaining to an individual all of whose offspring produced through self fertilization are identical to the parental type. True breeding individuals are homozygous for a given trait.