backcross

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backcross

[′bak‚krȯs]
(genetics)
A cross between an F1 heterozygote and an individual of P1 genotype.
References in periodicals archive ?
-- Wright (1968) showed that the minimum (effective) number of genetic factors responsible for the difference between species in a quantitative trait can be estimated from phenotypic means and variances of the parental species, [F.sub.1]s, [F.sub.2]s, and backcrosses. Lande (1981) generalized the method to wild populations.
After 11 backcrosses significant genetic variability still exists for all other traits.
The Canton-S, [F.sub.1], and backcross phenotypes were not sufficiently distinct that it could be determined from the backcrosses whether one gene or more was involved, but no bimodality or increase in variance was evident in the mating speeds of backcross progeny.
Because the jaunty locus lies near the middle of the second chromosome, the mutant allele should be associated in backcrosses with most of the D.
The second backcross program produced MD 52ne by using MD 90ne as the recurrent parent in five backcrosses and MD 65-11ne was the donor parent.
To assess how accurate leaf morphology is as a predictor of host-plant genotype three measurements on five haphazardly selected leaves from sample specimens of 32 trees were taken (5 pure Fremont, 7 pure narrowleaf, 4 F1 hybrids and 16 backcrosses).
Thus, D genome wheat SSRs also can be used to track wheat and jointed goatgrass D genome alleles in recurrent backcrosses to jointed goatgrass.
The initial cross of HC85-606 x HC94-634REBC was made in 1990 and subsequent backcrosses of the resistant progeny to HC85-606 were made in 1991-1992 at the Ohio Agricultural Research and Development Center, Wooster, OH.
Ankor was selected from the crosses and backcrosses 'Akron'/'Halt'//4* Akron made between 1994 and 1998.
After the 5th selfing generation following the three backcrosses to B73, Tx114 has been increased either by sibmating or by bulking selfed ears.
(1988) were the first to use recurrent backcrosses between common and tepary bean genotypes finding that the recurrent backcross hybrids retained very little of the tepary parent phenotype.
The analysis of variance was performed for the characteristics of low ([h.sup.2] = 0.20 to 0.50) and high ([h.sup.2] = 0.55 to 0.80) heritabilities to check for significant differences among means of populations representing the parent generations, F1 generations and backcrosses to infer the relevance of these traits for the study of genetic diversity (Tables 1 and 2).