> We could test X DNA to find something about a person's parent, but if > we test X DNA of a female, we would not know if that X DNA had come > from her mother or from her father. If the xDNA came from her father, he got it from his own mother, right? So if you test xDNA in a woman, it's from either her mother or her paternal grandmother -- 2 possible families of origin. Next generation back, 4 possible families. Etc. Is that correct? JRB