The number of DNA segments shared between people can be used to estimate a familial relationship, which could be anywhere between sixth cousins and full siblings. This high level of accuracy is based on the method by which relatives are found—sharing long segments of DNA. The probability for your DNA being from a certain country is based on a comparison between your DNA and the database. However, this means that each company will be working with its own specific system, making it possible to receive different results from different services. Unfortunately, even if your name is not located within the database, this does not mean other databases cannot be used to determine your identity. For example, maternal and paternal haplogroup testing can trace lineage further back (20-100 generations) than microarray-based autosomal DNA testing (around 10 generations). The majority of people in the world have DNA from numerous different regions. The kind of science done at AncestryDNA is cutting-edge. For example, the most accurate results are usually for Anglo-Saxon and European lineages as there is more data from people of these ethnicities in the respective databases to compare to. In addition, as more customers from more parts of the world are included, both the ethnicity estimate and matching results will also get better and better. By providing testing kits to people with four grandparents from one of over 50 underrepresented countries, this will help pave the way for more accurate findings. All rights reserved. Short Tandem Repeats (STR) testing may also be used to establish familial relationships between people. If the company responsible for running your test is sold, whatever you signed loses significance due to the privacy policies of the company. You can find this range by clicking on a specific ethnicity within your AncestryDNA report. This is a large amount of data not being used by services testing DNA. In terms of particular regions in an ethnicity estimate, the accuracy will—as is true for methods used by other testing companies —depend upon the region/population and the granularity of the prediction. Comparing the DNA sequences allows scientists to determine whether a child has inherited similar patterns to their supposed parent.. Once the test is complete, the probability of parentage is 0% if the pair are not related, and 99.99% if they are. You may be wondering if your genetic information will be used for research or sold and how this impacts your privacy. Here, we’ll take a look at some of the different purposes of DNA ancestry testing, and whether it’s worth ordering a home testing kit. The first step is to collect the DNA of people whose family has a long history in a particular part of the world. The higher the person is on your list, the more closely you are related. If AncestryDNA restricts itself to the continental level (Europe, Asia, Africa, etc. This person must understand their DNA is being matched to the current population as opposed to the people who occupied the region hundreds of years in the past. Other relationships are more difficult to assign for biological reasons. Once permission has been given, they are able to contact you and you can contact them as well. January 31, 2019. So AncestryDNA reports back a “Close Family” relationship instead of one of these specific relationships. A good example is if an individual wanted to know the origins of the African-American part of the family. Ethnicities are determined by looking at specific SNPs in the client’s DNA against those most commonly associated with certain global populations in the reference database.