Tyner/Tiner DNA Project
MTDNA RESULTS
MtDNA is carried from a mother to her children.
Her son does not pass on his mother's MtDNA as his children will then have their mother's MtDNA.
Her daughter will have and pass on her MtDNA to her children. Again her son would not pass it down but her daughter would, down through the generations.
WikipediaA person's maternal ancestry can be traced using his or her mitochondrial DNA (mtDNA). The DNA in the human mitochondria is passed down by the mother unchanged. One exception, which was linked to infertility, has been shown. Additionally, some people cite paternal mtDNA transmission as invalidating mtDNA testing [ 2 ] , but this is not considered problematic in scholarly population genetics studies or genetic genealogy.
What gets tested
mtDNA by current conventions is divided into three regions. They are the coding region and two Hyper Variable Regions (HVR1 and HVR2). All test results are compared to the mtDNA of a European in Haplogroup H2a2 . This sample is known as the Cambridge Reference Sequence (CRS). A list of single nucleotide polymorphisms (SNPs) is returned. Any "mutations" or "transitions" that are found are simply differences from the CRS.
The test results are compared to another person's results to determine the time frame in which the two people shared a most recent common ancestor (MRCA). The two most common mtDNA tests are a sequence of HVR1 and a sequence of both HVR1 and HVR2. Some people are now choosing to have a full sequence performed. This is still somewhat controversial as it may reveal medical information.
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