Why is it better to include a DNA sample from the mother when performing a paternity test?
In a matter as important as paternity, especially Legally binding cases, it is never good to leave room for doubt. Ideally, the mother, child, and alleged father should be tested. A child receives half of their DNA from their mother, and the other half from their father. Because the DNA half that the child receives from the mother will match the mother’s DNA exactly, the remaining unmatched DNA will match that of the biological father. Without the ability to remove the mother’s DNA from the equation, the possibility increases greatly that results will not be conclusive, which may require testing of additional genetic markers, thus extending the time and cost needed to achieve conclusive results. In general, if the mother is available for testing she should be included. In any event, the testing can still be performed and accurate results achieved without a sample from the mother.
