backcross

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

(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.

back·cross

(bak'kraws)

Mating of an individual heterozygous at one or more loci to an individual homozygous at the same loci.

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.