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.
Parental phasing is a form of DNA phasing done at GEDMatch with the Phasing tool. It uses one person and one or both of their parents.
In human genetics and genetic genealogy, autosomal DNA refers to the twenty-two chromosome pairs that make up the human autosome.
Archaeogenetics it the formal study of archaeology (ancient history) using genetics and DNA testing of ancient DNA samples.
Ancient DNA (aDNA) comes from grave sites that predate the modern era. It can be considered to include forensic DNA samples.
An ancestry-informative marker is an autosomal DNA SNP or an X-chromosome DNA SNP that is geographically restricted in its frequency.
The ancestral allele (sometimes called Ancestral SNP or Wildtype Allele) is the version of a genetic trait that is believed to be the original value.
An ancestral haplotype is believed haplotype (haploid genotype) of a common ancestor to a group of people.