(redirected from testcrossing)
Also found in: Thesaurus, Medical.


 (tĕst′krôs′, -krŏs′)
A cross between an individual exhibiting the dominant phenotype of a trait and an individual that is homozygous recessive for that trait in order to determine the genotype of the dominant individual.
tr.v. test·crossed, test·cross·ing, test·cross·es
To subject to a testcross.


(ˈtɛstˌkrɒs) genetics
(Genetics) a genetic test for ascertaining whether an individual is homozygous or heterozygous
vb (tr)
(Genetics) to subject to a testcross


(ˈtɛstˌkrɔs, -ˌkrɒs)

a genetic test for heterozygosity in which an organism of dominant phenotype, but unknown genotype, is crossed with an organism recessive for all markers in question.
test′-cross`, v.t.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.testcross - a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring
hybridisation, hybridization, hybridizing, interbreeding, crossbreeding, crossing, cross - (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
References in periodicals archive ?
While the core crosses of the dihybrid exercises are the two testcrosses (Figure 2A,B), several crosses are required to produce the dihybrid virgins for testcrossing.
2] plant had at least two spikes used for testcrossing to determine genotype, as well as one spike bagged to produce self-pollinated seed.
2] genotypes could not be differentiated directly but required that individual F2 plants be progeny tested by selfing or by testcrossing as female to another semigamy line with the virescent (rT) phenotype, since semigametic lines do not produce haploids when used as male in crosses with normal lines.
As expected, testcrossing cycles of WQS tended to reduce nutritional quality below that of respective cycles per se because the tester inbreds were not selected on the basis of quality, but rather for hybrid yield potential (Table 2).