testcross

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test·cross

(test'kros),
Crossing of an unknown genotype to a recessive homozygote so that the phenotype of the progeny corresponds directly to the chromosomes carried by the parents of unknown genotype.
Synonym(s): backcross (2)

testcross

(tĕst′krôs′, -krŏs′)
n.
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·crossing, test·crosses
To subject to a testcross.

testcross

Etymology: L, testum + crux, cross
1 a cross between a dominant and a recessive phenotype to determine either the degree of genetic linkage or whether the dominant phenotype is a result of a homozygous or a heterozygous genotype.
2 a subject undergoing such a test. See also backcross.
Testcrossclick for a larger image
Fig. 295 Testcross. A testcross to find the genotype of the unknown parent.

testcross

a cross in which one partner is homozygous (see HOMOZYGOTE for the recessive alleles of the genes being investigated. The testcross progeny will indicate the GENOTYPE of the unknown parent. See Fig. 295 . Test crosses are used extensively in experiments to establish GENETIC LINKAGE. See also BACKCROSS.
References in periodicals archive ?
The estimated average haploid percentages for Sese and SeSe produced when testcrossed as female to Sev7 were 9.
1], when testcrossed with Sev7, produced haploids with a range extending up to 26% (Fig.
2] plants were testcrossed to their respective single-cross tester at W.
2] population testcrossed to B73 x Mo17 was expected to have the same mean as its reciprocal population, (B73 x Mo17)[F.
Crosses were made among three sethoxydim-tolerant selections (S1, S2, S3) and two haloxyfop-tolerant selections (H1, H2), and the F1's were testcrossed to wild-type susceptible genotypes (20).
2]-derived families are testcrossed to a homozygous tester for AB, ab, or other gametes, assuming no linkage disequilibrium or epistasis.
2] plants are intercrossed and then testcrossed to a susceptible parent few or no susceptible [R.