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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

back·cross

(bak'kraws)
Mating of an individual heterozygous at one or more loci to an individual homozygous at the same loci.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Hybrids and backcrosses were found to be intermediate in mean morphology between the respective parental species.
This study offers germplasm that has been selected away from the high strength germplasm FFA by 11 backcrosses. Since most nonstrength genes from FFA are expected to have been lost due to the backcross selection procedure, these selected populations and their recurrent parent, DP 90ne, offer excellent genetic material for studying cotton physiology relations in yield and fiber strength.
Therefore, hybrids do not breed true and introgression is directional (i.e., no homozygous Fremont alleles were found in a hybrid background; therefore, no trees could be attributed to hybrid-hybrid crosses or backcrosses to Fremont; see appendix data summary).
All the congruity backcross lines were derived from five alternating congruity backcrosses between ICA Pijao and G40001 (Table 1) followed by nine generations of inbreeding during which individual plant or mass selections were made on the basis of agronomic characteristics.
The segregation in the backcrosses with parent-I and parent-II also fit to the theoretical ratio of1:1 further confirms the incomplete pattern of inheritance.
Although the fertilization and development rates obtained from the backcrosses were quite low as a result of the partial sterility of the F1 or backcross hybrids, adequate numbers of backcross hybrids were obtained based on the abundant F1 hybrid parents.
However, if backcrosses between hybrids and parental stocks do occur in the field, attempts to separate hybrids and their progeny from the parent species would be complicated because hybrid identification using standard morphometric and meristic measurements depends on the occurrence of intermediate traits (Gilbert, 1961).
The transmission rates of MA1 in backcrosses did not deviate from normal (50%) and the segregation ratio in BEAU2 was about 1:2:1.
Because all backcrosses were performed in the direction of H.
2: these backcrosses were not performed simultaneously and our experience shows that the frequency of encapsulation of any particular stock or genotype can vary by 10-15% over time.
In the summer of 1992, Hanna began screening more than 27,000 pearl millet backcrosses growing at Tifton.