This feature can be a disease causing mutation or a marker DNA sequence used to detect presence of another gene. Obviously these procedures used for testing the status of DNA, RNA or chromosomes are included in genetic tests. ... Meiotic recombinations that always occur take place during gamete generation, may separate a disease-associated gene and a marker DNA sequence which is used to detect mutated genes. ... During prenatal tests, a sample from the embryo's cells should be taken out by a procedure known as amniocentesis. ...

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