. . . . . "testcross"^^ . . "00851316-n"^^ . "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"@en-us . . . "100851316"^^ . . . "0"^^ . "100800317"@en-us . "test-cross"@en-us . . "0"^^ . "testcross"@en-us .