|Photo From Maternal Ancestry Store, Genebase|
Over and over the a3Genealogy DNA team are asked if mtDNA and X chromosome are the same. Simply, the answer is no. Yet, the mitochondrial DNA , carried down the female line to her children (sons and daughters), is passed from mothers and contributes to the X chromosome path. Sons, do not pass mtDNA.
mtDNA covers the hyper-variable regions of the genome and covers both recent and distant generations : 1) HVR1 (16024-16569) produces large number of matches 2) HVR2 (00001-00576) test results combined with HVR1 assists in identifying maternal ethnic and geographic origin, haplogroup. But genealogical gains are limited:
- Matching on HVR1 means that you have a 50% chance of sharing a common maternal ancestor within the last fifty-two generations. That is about 1,300 years. (1)
- Matching on HVR1 and HVR2 means that you have a 50% chance of sharing a common maternal ancestor within the last twenty-eight generations. That is about 700 years. (1)
- Matching on the Mitochondrial DNA Full Genomic Sequence test brings your matches into times that are more recent. It means that you have a 50% chance of sharing a common maternal ancestor within the last 5 generations. That is about 125 years. (1)
Is mtDNA Testing Helpful?
Yes. Researchers may uncover the following:
- Haplogroup: Identify the origin/general region of my maternal ancestors (Native American, Jewish, etc.? What was their migratory path?
- Indigenous: Identify an indigenous match. This is most helpful when matching ethnic groups. Are you Native American? Aborigines?
- Exact Match: With the assistance of your papertrail, descendants of maternal ancestors can be identified.
(2) mtDNA Testing for Genealogy, About.com
Accurate, Accessible Answers