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1. (n.) 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.
Etymology: (1930–35)
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| Definition of 'testcross' |
Princeton's WordNet |
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1. (noun) testcross, test-cross
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
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Definitions of testcross 
