Family Tree DNA is a division of Gene by Gene, a commercial genetic testing company based in Houston, Texas. Family Tree DNA offers analysis of autosomal DNA, Y-DNA, and mitochondrial DNA to individuals for genealogical purposes.amily Tree DNA's first mtDNA tests were for HVR1 (hypervariable region 1) of the mtDNA. Eventually, they added a Plus test that tested for both HVR1 and HVR2.