How to Make Genealogy with DNA? Are the Results Reliable?

While advances in medicine are rapidly advancing genetic ancestry testing The aim can be to provide information about ancestral roots and to connect with distant relatives. Especially adopted or immigrant persons Can some deviations be observed in this method?

Between companies performing the tests or between identical twins outcome differences is it possible?

Different ancestor profiles can be reported with a DNA sample.

You may think that when identical twins are given DNA samples, the results will be the same. However, that is not the case. The results from a single company were different. one of the twins 13 percent European While in the other one, this result was only 3 percent.

Reasons for assigning different profiles include significant differences in the past inhabitants of an area. to migrate It is also available. The fact that the term ancestry is subject to various interpretations such as geographical, historical, cultural and religious brings errors or ambiguities in genetic root inference.

Well, even if we assume that the tests were carried out using the correct methods, the results Why might it turn out differently?

Every company’s DNA databases are different.

DNA testing companies, uses its own databases when evaluating the results. The larger and more diverse these databases are, the more accurate the test results can be. However, some such as Africa and South Asia ethnic groups Results for individuals belonging to these groups are less accurate because they are less represented than others.

Moreover genetic sciences Considering that there are new discoveries in the field, companies genetic knowledge base It needs to be updated frequently. Only in this way is it possible to approach the results more accurately.

In genetic testing, entire genomes are not sequenced.

Companies, possible It does not look at all genetic variation. Millions of single nucleotide polymorphisms found in DNA (SNP) focuses. Although this method is used because SNPs are transferred through generations, this is where the database comes into play. SNP results must match a database of people with known ancestors.

Another problem at this point is that there is a tendency to make big mistakes, even if they are small. Even though 99.9 percent accuracy is mentioned in genome sequences, 1,000 errors in processing 1 million places receivable.

It should not be forgotten that it is a computer program that makes the predictions.

As a result of the DNA test, 20 percent European, 30 percent Chinese, etc. You may encounter data. Because algorithms based on the person’s SNP data different combinations of ancestors doing. This actually means a deficiency in distinguishing between ancestors that are genetically very similar to each other.

While the results may vary from person to person, the effects may also be different.

While some users find themselves with a different ethnicity than the ethnicities they know, others may receive results that confirm their family stories and history. Unexpected findings about ancestral origins and family relationships psychosocial consequences can also give birth.

In addition, while the probability of detecting a first-degree cousin may be 100 percent in such services, the percentage of detecting a third or fourth generation cousin can drop to 15 percent. That’s why How accurate is it to create a complete family tree? Could it be?

It would be better not to take action immediately.

As a result of DNA test If 10 percent of you are Norwegian and you do not have an ancestry document, you should not immediately start looking for your ancestors. This percentage will probably change in another test.

If you get the same consistent results from different companies, then you can buy your plane ticket and move towards Norway. But keep in mind that the most reliable indicator of your ancestry is not an estimate of ethnicity, Names of people you matched with and pedigrees.

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