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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.
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
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.
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.
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
backcrossa 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