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There are three major types of genealogical DNA tests: Autosomal (which includes X-DNA), Y-DNA, and mtDNA. Autosomal DNA tests look at chromosome pairs 1–22 and the X part of the 23rd chromosome. The autosomes (chromosome pairs 1–22) are inherited from both parents and all recent ancestors.
The Genomics Research Center initially did testing for many of the same products that had been sold by DNA-Fingerprint. They began to offer individual and panels of Y-chromosome SNP tests using Sanger testing methods. They also offered the mtDNA full genome test and upgrades to it using the Sanger testing method. [citation needed]
In 2007, 23andMe was the first company to offer saliva-based direct-to-consumer testing, [13] and the first to use autosomal DNA for ancestry testing. [ 14 ] [ 15 ] An autosome is one of the 22 chromosomes other than the X or Y chromosomes.
A Y-DNA test analyzes similarities in Y-chromosome DNA markers, corresponding to specific locations on the Y chromosome. Markers have a Short tandem repeat (STR) that involve repeats of 2–5 DNA base pairs. At Sorenson labs, the number of STRs in a 36-marker haplotype was compared between the sample given and the database to determine relatedness.
DNA Solutions offers the analysis of mitochondrial DNA (mtDNA); whilst only inherited maternally, mtDNA is found in both men and women. DNA Solutions sequences both the HVR1 and HVR2 regions for maternal ancestral and ethnic analysis. Mt-DNA testing is also used for proving biological relationships (i.e. cousins, granddaughter-grandmother, etc.)
Jewish Genealogy-DNA Tests Lauren Gilbert, a senior manager at the Center for Jewish History (CJH), participate in a global online conference to launch genealogy testing for Holocaust survivors ...
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