An X-match is a genetic match that shares a relevant DNA segment on the X-chromosome. Because the X-chromosome follows a different inheritance pattern than autosomal DNA, X-matches are highly significant for some genealogy applications.
The Journal of Genetic Genealogy (JoGG) is a peer reviewed journal dedicated to the topics of genetic genealogy and population genetic citizen science. Its editor in chief is Dr. Leah Larkin.
Genetic imputation is the process of determining untested genetic markers in an individual using their tested markers and haplotypes from reference samples.
A founder effect is when a small group from one population forms a second new population. Due to the small number of founders, the genetics of the new population are different from the first one.
In population genetics, a haplogroup is a group of related haplotypes. However, in genetic genealogy, a haplogroup has come to mean a branch on either the maternal or the paternal tree of humanity.
Gene by Gene is the parent company of Family Tree DNA. It's primary owners are Bennett Greenspan and Max Blankfeld.
In genetic genealogy, a DNA segment is a length of DNA on either an autosomal DNA chromosome or the X-chromosome that is shared between two or more people.
Endogamy is the practice of marrying those from the same religious, ethnic, or other social group. It has historically been enforced by social constraint or taboo.
In genetic genealogy, chromosomes are the genetic storage units of the DNA in the nucleus of our cells. This includes the autosomal chromosomes and the sex chromosomes.
In genetic genealogy, a back mutation refers to a case where the genetic marker has had a second mutation that causes it to go back to the original value. It is most common to consider back mutations in Y-DNA STR values. However, back mutations occur in all DNA types.