Y-DNA Update

12 July 2025. Several Causey/Cossey males have recently purchased the Family Tree DNA Big 700 Y-DNA test. According to FamilyTreeDNA.com, “The Y chromosome is passed from father to son remaining mostly unaltered across generations, except for small traceable changes in DNA. By tracking these changes, we constructed a family tree of humankind where all male lineages trace back to a single common ancestor who lived hundreds of thousands of years ago. This human tree allows us to explore lineages through time and place and to uncover the modern history of your direct paternal surname line and the ancient history of our shared ancestors.”

Almost all men in the United States who share the surname CAUSEY also possess the Y-DNA linked to the T-M70 Haplogroup. But, due to a mutation that occurred sometime around 1750 AD (probably with the birth of Thomas Causey-II 1719-1775), a new Causey genetic branch came into existence.

So, now that we know that some of our Causey cousins possess Haplogroup T-FTE36788 (The Old Line) and now other Causey cousins find their Confirmed Y-DNA Haplogroup is T-FTE75400. Who is the Most Recent Common Ancestor to T-FTE36788 and who is the Most Recent Common Ancestor to T-FTE75400?

That’s all for now. Next time we will dig a little deeper. wrc