['testkrɔs;-krɔ:s] n. 测交(一种使杂种子一代与隐性类型交配以测定杂种子一代遗传型的方法)
testcross
[ noun ] 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 <noun.act>