Establish the various U. S. Throckmorton/Throgmorton Y chromosome DNA signatures. The results have confirmed that John Throckmorton, b. 1601, of New England & John Throckmorton, b. 1633, of Virginia, both descend from Thomas Throckmorton, b. 1412, of Coughton Court, Warwickshire. It has also been proven that the Throgmortons from Henrico Co, VA & the Thogmartins are not descended from Thomas Throckmorton, b. 1412.