The McGrew Family DNA Project was begun in February, 2006. In the first year of existence we have learned that the northern branch of the family descended from Robert McGrew is genetically related to the southern branch descended from James A. McGrew. These branches may also be related to the line of Thomas McGrew (see Family Patriarchs page). We have also learned that our Scots-Irish ancestors who left from Scotland in the early 1600's and settled in the near Omagh in the Ulster Plantations of ireland were originally Irish. They may have moved to Scotland from Ireland sometime between 500-1000 AD.
Also many McGrew's are descended from an Alexander McGrew/MacGruar whose line is quite distinct from the Omagh McGrew's. Alexander's descendants spred through the southern United States in the early 1800's and then into Texas. Recently DNA testing has shown that this line has origins in the Pretani tribes of Scotland several thousand years ago.
A third genetically distinct McGrew line has just been found. Two known descendants of Andrew McGrew/Megrue have matched 25/25 and are Haplogroup R1a which is Norse Viking in origin.
General Information and Family DNA Projects Summary
http://freepages.genealogy.rootsweb.com/~allpoms/genetics1a.html
Comprehensive listing of family DNA projects and DNA references
Graves DNA Project - http://www.gravesfa.org/dna.html
Excellent discussion of DNA testing and genealogy.
Mumma DNA Project – http://www.mumma.org/DNA.htm
References Cited:
http://www.familytreedna.com/dna101.html
Family Tree DNA web site tutorial
blairdna.com/dna101.html
Blair DNA Project - DNA 101: Y-Chromosome Testing
http://www.kerchner.com/dna-information.htm
Kerchner's DNA Testing & Genetic Genealogy Info Resources Page
Last Modified: October 10, 2009