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backcross

 [bak´cros″]
in experimental genetics, union between a heterozygote of the first generation and one of its parents or an organism genetically identical to one of its parents.
double backcross the mating between a double heterozygote and a homozygote.

back·cross

(bak'kros),
1. The mating between an animal that is homozygous at a locus of interest and an animal that is heterozygous, commonly from the same ancestral stock.
2. Synonym(s): testcross

backcross

/back·cross/ (bak´kros) a mating between a heterozygote and a homozygote.

backcross

(băk′krôs′, -krŏs′)
tr.v. back·crossed, back·crossing, back·crosses
To cross (a hybrid) with one of its parents or with an individual genetically identical to one of its parents.
n.
1. The act of making such a cross.
2. An individual resulting from such a cross.

backcross

Etymology: AS, baec + cruc, cross
1 a mating (cross) between a heterozygote and a homozygote.
2 an organism or strain produced by such a cross. See also testcross.

back·cross

(bak'kraws)
Mating of an individual heterozygous at one or more loci to an individual homozygous at the same loci.
Backcrossclick for a larger image
Fig. 59 Backcross . Results from different parental types.

backcross

a genetical term describing a mating between a HYBRID organism and one of the original parental types. The results of a backcross depend upon the parental type.

A backcross to the recessive parental is diagnostic (since it reveals the genotype of the hybrid) and is called a TESTCROSS.

backcross

mating the crossbred offspring of a two-way cross back to one of the parent breeds.
References in periodicals archive ?
F1 hybrids and F2 backcross hybrids were raised and used as parental broodstock in 2 cycles of backcrossing.
Interval-specific congenic (ISC): Animals generated by crossing animals from two inbred strains and then repeatedly backcrossing offspring carrying a desired DNA segment into one of the parental strains.
The base population of naked neck line was developed after four successive generations of backcrossing and is maintained under mild selection pressure for six week body weight for the last six generations.
Upper grades study forest ecology, perform DNA experiments, and study the genetics of backcrossing Chinese chestnut hybrids to surviving native chestnuts, aiming for a tree that incorporates the desirable characteristics of the native with just enough Chinese to resist blight.
Over several years, the researchers used backcrossing to eliminate unwanted traits--like tiny tubers and poor taste--from resistant plants they had created.
Article 14(5)(c) of the 1991 Act of the UPOV provides examples of what constitutes an essentially derived variety from a scientific viewpoint: "Essentially derived varieties may be obtained for example by the selection of a natural or induced mutant, or of a somaclonal variant, the selection of a variant individual from plants of the initial variety, backcrossing, or transformation by genetic engineering.
Consequently, breakages may result in viable gametes with aneuploid numbers that can become stabilized through backcrossing or selfing.
For instance, marker-assisted backcrossing is gaining in use and will continue to deliver on the promise of MAS.
1] hybrids, as well as to detect the introgression of alleles between species by hybrid backcrossing.
By backcrossing a number of corn varieties in the 1930s, cereal breeder Paul C.
The lack of a clear "intermediate" hybrid phenotype in the individuals we identified with Nelson's mtDNA suggests successful backcrossing, which appears to be asymmetrical and biased toward Saltmarsh Sparrows.
This observation is mainly due to the selection of plants carried out for the first backcrossing generation, which was based only in phenotypic observations.