test-cross

1. Wild abortion ( WA) type CMS line Jin 1A was used to test-cross with 33 American rice varieties and F_1 pollen fertility was tested.
   利用野败型不育系缙1A对33份美国稻的恢保关系进行了测定，观测了F1的小穗育性。

noun

1. 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

   Synonym:    testcross