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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 ?
Therefore, the objective in this study was to introgress the blast resistance gene into local Malaysian variety, MR264 by applying marker-assisted backcrossing breeding program and thereby enhancing the background selection.
Frequency of favourable allele for background QTLs under different population sizes : MBLUP was background selection method, the figure 5 show that during backcross phase, the difference of frequency of favourable allele for background QTLs is a little between two population sizes, backcrossing three generations, under two different population sizes: 500 and 1000, frequencies of favourable allele for the first background QTL were 0.
The other methods (Figure 1A to F) did not correctly reproduce the clustering, and the RC1b generation was not clustered together with the other backcrossing generations with its respective recurring parent.
F1 hybrids and F2 backcross hybrids were raised and used as parental broodstock in 2 cycles of backcrossing.
1] plants with the SAP6 and SU91 markers for subsequent backcrossing with the susceptible dark red kidney parents.
If resistance or host-recognition genes are dominant in hybrids, then backcrossing could lead to a variety of results [ILLUSTRATION FOR FIGURES 1C, D OMITTED].
Second, in a cottonwood hybrid zone with unidirectional introgression, hybrids accumulated all the species associated with the parent species that formed backcross intermediates, but numerous arthropods failed to cross the genetic gap with the other parent species where backcrossing was absent (Floate and Whitham 1993; K.
The genetic stocks were developed by crossing the recurrent parents Atlas, Kansas Collier, Rox Orange, and Early Hegari-Sart to brown midrib sources N121 (bmr-6) and F220 (bmr-12, donated to our project by the late Robert Kalton), followed by a minimum of four cycles of selfing and backcrossing.
Through breeding and backcrossing, scientists took a two-pronged approach to curbing earworm damage: First, they selected plants whose silks produce enough maysin to stop the caterpillar from feeding after just a few bites.
Specifically, our models give the conditional probability distributions for the number of markers indicating mixed ancestory as a function of the number of markers examined for various backcross categories under a scenario of unidirectional backcrossing.
All second generation crosses are expected to produce the same frequency of class C seeds, but only backcrossing to I.
3] with three to four cycles of backcrossing and selfing to recover the recurrent parent phenotype.