backcross

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backcross

[′bak‚krȯs]
(genetics)
A cross between an F1 heterozygote and an individual of P1 genotype.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In the first place, species hybridization followed by repeated backcrossing is a classic plant breeding technique when the desired traits (genes) cannot be found in the cultivated species.
The length of the intact donor chromosome segment around a target gene in marker-assisted backcrossing. Genetics, 157: 1343-1356.
A conventional backcrossing program involved the production of varieties that are similar to the susceptible parent but incorporated with required resistance gene.
Frequency of favourable allele for background QTLs under different ratios of QTL variance:MBLUP was background selection method, the result show in figure 4: during backcross phase, frequency of favourable allele for two background QTLs differ greatly among different ratios of QTL variance, backcrossing two generations, frequency of favourable allele for two background QTLs were 0.88 and 0.92 with the ratios of QTL variance, being 10% and 30% respectively, backcrossing five generations, the frequency rise to 0.98 and 1.00 under the same corresponding ratios of QTL variance.
Figure 2 (TACF 2007) illustrates the backcross method--showing the progression of trees first being crossed to establish a 1/2 American, 1/2 Chinese generation, denoted as [F.sub.1], then through continued backcrossing eventually ending with 15/16 American, 1/16 Chinese, denoted [B.sub.3].
Backcrossing maintains the desired genetic complexes that are already present in adapted genotypes while allowing recombination between exotic and adapted genomes.
More reliable molecular/genetic techniques may be required to determine if backcrossing and introgression are occurring or if multiple cyprinid species are present.
The theoretical proportion of the donor genome in near-isogenic lines of self-fertilizers bred by backcrossing. Euphytica 30:227-238.
If there were ever a need to totally regenerate the Navajo-Churro breed from the ARS collection, a backcrossing strategy could be used.
Using an elaborate computer simulation of the way genes can spread between and within populations, the team concluded that backcrossing is probably very rare.
In fact, with the exception of two individuals, marker numbers were more consistent with pedigrees involving three to seven backcross generations rather than the two generations of backcrossing actually employed.