testcross

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test·cross

(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.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

testcross

(ˈtɛstˌkrɒs) genetics

(Genetics) a genetic test for ascertaining whether an individual is homozygous or heterozygous

vb (tr)

(Genetics) to subject to a testcross

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

test•cross

(ˈtɛstˌkrɔs, -ˌkrɒs)

n.

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.

[1930–35]

test′-cross`, v.t.

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Noun

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

test-cross

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

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References in periodicals archive ?

Comparison of phenotypic correlations among S1 lines, and their testcrosses, from four Iowa Stiff Stalk populations of maize.

Associations among production and physicochemical-quality fruit traits in Passion fruit populations subjected to three cycles of intrapopulation recurrent selection/Associacoes entre caracteristicas produtivas e de qualidade fisico-quimica de frutos em populacoes de Maracujazeiro-azedo submetidas a tres ciclos de selecao recorrente intrapopulacional

These results indicated that heterosis in grain yield was presented in the testcrosses which was mainly ascribed to grain weight and grain number.

Detection of QTLs for Yield Heterosis in Rice Using a RIL Population and Its Testcross Population

High genetic correlations coefficients among testcrosses at early and later inbreed generations were reported by Bernardo [30].

Inheritance of nitrogen use efficiency in inbred progenies of tropical maize based on multivariate diallel analysis

The second group included 70 testcrosses hybrids with averages between 6 369 and 8 536kg [ha.sup.-1], while the third group was formed by 30 testcross hybrids showing the worst performance in terms of grain yield, ranging from 1 535 to 6 193kg [ha.sup.-1].

Performance of testers with different genetic structure for evaluation of maize inbred lines/Desempenho de testadores com diferentes estruturas geneticas para avaliacao de linhagens endogamicas de milho

Four possible exercises are presented: two dihybrid testcrosses (Figure 2A,B) and two trihybrid testcrosses (Figure 2 C,D).

Laboratory exercises to examine recombination & aneuploidy in Drosophila

The [s.sub.4] lines per se and the testcrosses were evaluated at Sinematialli under Striga-free conditions and at Ferkessedougou under artificial infestation with S.

Registration of 16 extra-early maturing Striga resistant tropical maize inbred lines

At the [S.sub.4] stage of inbreeding, 450 to 500 lines derived from each population were evaluated for general combining ability in testcrosses and for performance per se in replicated trials at Ferkessedougou (9[degrees]30'N, 5[degrees]10'W), and Sinematialli (9[degrees]37' N, 3[degrees]04' W) both in Cote d'Ivoire which are hereafter referred to as Ferke and Sine, respectively.

Registration of 16 Striga resistant early maturing tropical maize inbred lines

The random nongenetic effects had a normal distribution with a mean of zero and were scaled so that broad-sense heritability among testcrosses was H = 0.20, 0.50, or 0.80 in the initial [F.sub.2] population.

Usefulness of gene information in marker-assisted recurrent selection: a simulation appraisal

Thus two types of progeny were developed: the lines per se (represented by a mating structure of [F.sub.1]R[M.sub.10][S.sub.2]) and their corresponding testcrosses with Monsanto 7051.

Genetic analysis of corn kernel chemical composition in the random mated 10 generation of the cross of generations 70 of IHO X ILO

In the testcrosses, metaphase I chromosome pairing configurations of 13" + t1" + t' indicated that a spontaneous homoeologous translocation had occurred in the double-monosomic B[C.sub.1][F.sub.1] plant.

Registration of four durum germplasms carrying glutenin allele Glu-Dld on a 1AS.1AL-1DL translocation chromosome

[S.sub.2] testcrosses with Iowa Stiff-Stalk Synthetic (BSSS) related single-cross tester B73/B94 were produced in 1993 and evaluated in trials at one site with conventional-tillage and one with minimum-tillage, near Wooster, and at an additional site near South Charleston, OH, in 1994.