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testcross

[test-kraws, -kros]
noun
  1. a genetic test for heterozygosity in which an organism of dominant phenotype, but unknown genotype, is crossed to an organism recessive for all markers in question.
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Origin of testcross

First recorded in 1930–35; test1 + cross
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018