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The X chromosome test is often done when two sisters that have different mothers want to establish whether they have the same biological father. If their X chromosome patterns match than they share the same father. The mother’s share of genetic inheritance will be different for each sister and will not pose any problems when examining the DNA profiles.
In cases where females share the same mother, an X-chromosome test can still be done; however, this test is only possible if the mother is available for testing. If the mother is not available for testing, then you will need to do an STR siblings test. The reason for needing the mother’s samples is the following:
Any female inherits one X chromosome from their mother and one X chromosome from their father. If two siblings share the same mother, thereby being at least half siblings from the mother’s side, an X-chromosome test will not be able to determine which X chromosome was inherited from the mother and which from the father. Having the mother’s DNA means we can exclude her share in genetic inheritance and concentrate on matching the X chromosome from the father’s side.
The X chromosome test is priced at $599 for the testing of two females. There will be extra costs for added persons wishing to be tested. Should you wish us to advise you on your case, please contact us.
You can Order Here to proceed with you test. Results will be available in only 14 -21 working days.
You can also return to our DNA Relationship Testing page for more information.
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DNA Tests Available