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 ?

In both cases, the trihybrid virgin females are testcrossed to ([y.sup.1] [w.sup.1] [cv.sup.18]) tester males.

Laboratory exercises to examine recombination & aneuploidy in Drosophila

In the [F.sub.2], plants with 14" were selected and testcrossed to Langdon double-ditelosomic 1A to identify plants carrying a 1A.1D translocation.

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

These F1 flies were either mated together to produce dihybrid F2 data or were testcrossed to produce dihybrid testcross data.

Recombination frequency and linkage distance

In summer 2002 at Saint Paul, So plants from each population were testcrossed (as female parents) to BSSS inbred LH295 (male parent) in an isolated field.

Genetic variation in maize breeding populations with different numbers of parents

DE3 and DE4 inbred lines ([S.sup.8]) were derived from a Germplasm Enhancement of Maize (GEM) breeding cross ([S.sup.0]) (Brazilian tropical maize single-cross Dekalb hybrid DKXL212 crossed to elite non-Stiff Stalk temperate inbred N11a) using pedigree selection and early-generation yield testing initiated with [S.sup.2] lines testcrossed to LH198 and individual ear selection through the [S.sup.5] generation.

Registration of DE3, DE4, and DE5 parental inbred lines of maize

[S.sub.2] progenies that produced testcrosses in the top 10% for yield in the 1999 trials were selected and testcrossed to two non-BSSS proprietary inbreds (Golden Harvest IN504 and IN354) during the winter season of 2000-2001.

Registration of maize germplasm line GEMS-0002

For each of the four tester populations (i.e., Pioneer Hi-bred, Forage Genetics, Hungarian, Innovator +Z), the population mean was estimated as the average of the within population genotypes (Table 1) testcrossed to the whole population.

Heterosis in a broad range of alfalfa germplasm

The [F.sub.1] from G7-5 x T586 was testcrossed as female with a normal nonrestoring genotype, H1330 (Bourland, 1996), while the [F.sub.1] from G7-5 x T582 was used as female in a backcross with T582.

Linkage analysis between gametophytic restorer [Rf.sub.2] gene and genetic markers in cotton

Similar to the [F.sub.2] population, the heterozygous individual B[C.sub.1][F.sub.1] plants, when testcrossed with Sev7, produced progeny with a wide range of haploid percentage (4 to 26%), except for one B[C.sub.1][F.sub.1] plant that produced >40% haploid plants.