Y Chromosome Test

The Y chromosome DNA test compares the DNA of two or more men to verify if they share the same paternal line. The Y chromosome is transmitted only from father to son, which allows identifying a common male ancestor.

The analysis is based on the study of specific markers of the Y chromosome from a simple buccal sample. This test allows confirming or excluding belonging to the same paternal family, without determining the exact degree of kinship.

The paternal lineage can be defined when male participants share a common male ancestor, transmitted through the Y chromosome. This test is relevant in several family configurations, especially when transmission is done exclusively through the male line.

It can notably be performed between brothers or half-brothers (having the same father), between cousins from the paternal branch, between an uncle and his nephew, or even between a paternal grandfather and his grandson. In all cases, the objective is to verify if the Y chromosome profiles are compatible with the same paternal lineage.

The Y chromosome comparison test is a relationship test: it directly compares the DNA of several men to determine if they belong to the same paternal lineage. It is used to confirm or exclude a biological link within a family, without providing information about geographical or ancestral origins.

In contrast, the Y chromosome genealogical DNA test aims to explore the origins of the paternal lineage over the long term. It compares certain genetic markers to large reference databases to estimate ethnic origins, to identify haplogroups and to trace ancient migrations of male ancestors.

Thus, a genealogical Y chromosome test does not allow for a definitive biological relationship to be established between two people. To confirm a familial relationship, a relationship DNA test remains essential.

Paternity search between sisters is based on X chromosome analysis, which allows to verify if two women share the same X chromosome transmitted by a common biological father.

For this test to be relevant, it is essential that both sisters have the same biological mother, a necessary condition to correctly interpret genetic results.

The paternal lineage test, based on Y chromosome analysis, allows you to explore the origins of your paternal ancestry and trace the male lineage of your family. Transmitted exclusively from father to son, the Y chromosome provides precise analysis of the direct paternal line.

This genealogical DNA test notably provides information about your geographic origins, your paternal haplogroup, the ancient migrations of your male ancestors, and possible genetic matches with people sharing the same DNA. Performed individually from a saliva sample, it also allows, in some cases, to identify unknown paternal parents or distant relatives.