noun. 1  Linguistics A predictable phonetic variant of a phoneme. 2  For example, the aspirated t of top, the unaspirated t of stop, and the tt (pronounced as a flap) of batter are allophones of the English phoneme &sol;t&sol;. 3  or Allophone Canadian A person whose native language is other than French or English.
What is genetic testing? Genetic testing is a type of medical test that identifies changes in chromosomes, genes, or proteins. The results of a genetic test can confirm or rule out a suspected genetic condition or help determine a personâs chance of developing or passing on a genetic disorder. More than 1,000 genetic tests are currently in use, and more are being developed. Several methods can be used for genetic testing: Molecular genetic tests (or gene tests) study single genes or short lengths of DNA to identify variations or mutations that lead to a genetic disorder.
Genetic screening tests. Some genetic tests are used even when symptoms of a disease are not seen, but the genetic information may help in predicting if the person is at risk of developing, or are susceptible to a particular disease.hrough genetic testing we may be able to screen populations for diseases in order to better diagnose, treat and prevent disease. Reducing the incidence of disease has major impacts on and is of great importance to: 1  Families: When a child is born with a particular disease, there may be no apparent family history.