Anonymous
Anonymous asked in Arts & HumanitiesGenealogy · 1 month ago

If one of my siblings and myself took the Ancestry DNA test would it tell us if we were siblings or half siblings?

7 Answers

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  • 6 days ago

    I think you would need a paternity test for that.

  • 3 weeks ago

    DNA testing companies test for genetic markers commonly found in various human populations.

  • 4 weeks ago

    Not necessarily. It could tell you if your are related.

  • 1 month ago

    No, not 100%.

    In theory, two siblings from the same two parents could have NO DNA in common.

    • Zirp
      Lv 7
      4 weeks agoReport

      without crossing over, that would happen once in every 2⁴⁶ cases = once in over 64 trillion...

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  • Zirp
    Lv 7
    1 month ago

    If the DNA-company would compare both your DNA's, it would find that you share about 23 chromosomes if you are full siblings, and about 11 or 12 if you are halfsiblings.

    DNA-ancestry-tests don't really find your ancestors. They find people with chromosomes (almost) identical to yours, like your 5th cousin twice removed, if those are in that company's database.

    Some of those companies will even help you contact the relatives of yours that they find, provided that both parties involved give explicit permission for that

  • Pearl
    Lv 7
    1 month ago

    it might tell you that

  • 1 month ago

    Yes it sure would.

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