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.
There are many different types of genetic tests. Genetic tests can help to: 1  Diagnose disease. 2  Identify gene changes that are responsible for an already diagnosed disease. 3  Determine the severity of a disease.enetic testing is voluntary and the decision about whether to have genetic testing is complex. A geneticist or genetic counselor can help families think about the benefits and limitations of a particular genetic test.