testcross(redirected from testcrossing)
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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.
(Genetics) a genetic test for ascertaining whether an individual is homozygous or heterozygous
(Genetics) to subject to a testcross
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.
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|Noun||1.||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|