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DNA test

DNA analysis

Do you want to take a DNA test?

Have you done one, and want to analyze the results?

First of all, you should know that in France these so-called “recreational” tests are – to date – not authorized. This does not prevent a growing number of people from contacting foreign companies offering this service.

What is the point of taking a DNA test?

  • know your ethnic origins

  • discover people – who have also taken a test – whose chromosomes have fragments identical to yours.

What is the principle?

Sharing a DNA fragment with a person means that we have an ancestor (or a pair of ancestors) in common.
This value, which can be expressed as a percentage, reflects your genetic proximity.
A 100% match indicates without any doubt that you are identical twins. At the other end of the scale, a rate of 0.3% defines you as very distant cousins...

genetic genealogy

And concretely, what information can we draw from it?

The lower the rate of shared DNA, the more genetically distant the relationship, the greater the work of interpretation, and the more uncertainty there is about the real degree of kinship.
This is where comes in Dessine-moi un arbre …

Grouping of correspondences into “clusters”, triangulation, determination of the common ancestor, make it possible to precisely establish the relationship. And beyond that, this can lead to a rewriting of the genealogy when it does not coincide with genetic reality. Most families in fact present what we call “non-filial events: birth of an unknown father, adoption, adulterous child recognized by the spouse, birth following a gamete donation, etc.

These question marks can thus be resolved, by jointly pursuing a classic genealogical approach and the use of techniques specific to genetic genealogy.
Without forgetting that access to recent civil status (under 75 years old) is often essential.

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