[ test-kraws, -kros ]
/ ˈtɛstˌkrɔs, -ˌkrɒs /


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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019