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A child with the disease is born to healthy parents who are unaware of their carrier status. The allele that A laboratory test of a person's genes or chromosomes for abnormalities, defects or deficiencies, including carrier status, that are linked to physical or mental disorders or impairments, or that indicate susceptibility to illness, disease or other disorder, whether physical or mental, which test is direct test and not an indirect manifestation of genetic disorders. Find Genetics flashcards to help you study for your next exam and take them with you on the go! With Quizlet, you can browse through thousands of flashcards created by teachers and students — or make a set of your own! Study with Quizlet and memorize flashcards containing terms like in Mendelian genetics what?, patterns that do not follow mendelian genetics, polygenic trait and more. , True-breeding plants are called _____. 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