[test-kraws, -kros] 
| 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. |
| test·cross (těst'krôs', -krŏs') n. 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. |
