Ancestry DNA tests provides information about the possible origin of an individual’s ancestors who undergo genetic analysis. This is done by comparing the person’s genetic material with that of reference populations of known geographic origin and ethnicity.
With a genetic predisposition test it is possible to know many aspects that genes reveal about each person, including ancestors. The study of the ancestry of human genes is a continuous and cumulative process; as the number of populations studied grows, so will the knowledge about past events.
In a DNA ancestry test, certain patterns of a person’s genetic variation are analyzed and compared to a database of people of known ethnic and geographic origin. Those common variations will determine the percentage of your genes that descend from that population.
It is important to know where our genes come from, since it has been shown in several studies that many of the health conditions or vulnerability of individuals or populations to certain pathologies or infectious agents are conditioned by genes ancestry.
To know where a person’s genes come from, a genetic or DNA test that includes ancestry must be performed. The tellmeGen DNA test shows gene ancestry, in addition to many other results. To determine ancestry, a relevant fraction of the data obtained in the genotyping corresponding to autosomal DNA is used. This fraction is compared with thousands of individuals distributed in 70 ethnic groups, whose information is in public databases.
The report shows, as a percentage, the allocation of the genetic composition in the different ethnic groups considered, organized by geographical location. In general, populations that are geographically closer to each other show greater genetic affinities.
In short, genetic ancestry tests allow those interested in their family history to obtain complementary information to the one they could find through their relatives or in historical documentation.
Examining DNA variations can provide clues about the origin of a person’s ancestors. Certain patterns of genetic variation are often shared among people of a particular origin, and this yields valuable information that, with just a saliva sample, can be easily obtained for genetic testing.