Familytreedna.com can give a much better explanation than I can,but, I know the y chromesome only passes from father to son. If you have a brother from looking at your tree he would be a good canidate for the Jordan line. I am interested in the William Isaac line but like every one else can't get past that brick wall..My line is;
William Isaac Jordan + Mahulda Isaacks
Andrew C
Mary Ann (Mollie) Jordan + William Wade Ellis
Tilliam Hampton Ellis
Rupert (me)