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.
Origin of testcross
First recorded in 1930–35; test1 + cross
Words nearby testcross
test ban, test-bed, test blank, test card, test case, testcross, test-drive, testectomy, testee, tester, testes