Biology:Genetic genealogy

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Genetic genealogy is the use of genealogical DNA tests, i.e., DNA profiling and DNA testing, in combination with traditional genealogical methods, to infer genetic relationships between individuals. This application of genetics came to be used by family historians in the 21st century, as DNA tests became affordable. The tests have been promoted by amateur groups, such as surname study groups or regional genealogical groups, as well as research projects such as the Genographic Project.

(As of 2019) about 30 million people had been tested. As the field developed, the aims of practitioners broadened, with many seeking knowledge of their ancestry beyond the recent centuries, for which traditional pedigrees can be constructed.

History

George Darwin, the first person to estimate the frequency of first-cousin marriages

The investigation of surnames in genetics can be said to go back to George Darwin, a son of Charles Darwin and Charles' first cousin Emma Darwin. In 1875, George Darwin used surnames to estimate the frequency of first-cousin marriages and calculated the expected incidence of marriage between people of the same surname (isonymy). He arrived at a figure of 1.5% for cousin-marriage in the population of London, higher (3%-3.5%) among the upper classes and lower (2.25%) among the general rural population.[1]

Surname studies

A famous study in 1998 examined the lineage of descendants of Thomas Jefferson's paternal line and male lineage descendants of the freed slave Sally Hemings.[2]

Bryan Sykes, a molecular biologist at Oxford University, tested the new methodology in general surname research.[3] His study of the Sykes surname, published in 2000, obtained results by looking at four STR markers on the male chromosome. It pointed the way to genetics becoming a valuable assistant in the service of genealogy and history.[4]

Direct-to-consumer DNA testing

In 2000, Family Tree DNA was the first company to provide direct-to-consumer genetic testing for genealogy research. It initially offered eleven-marker Y-chromosome STR tests and HVR1 mitochondrial DNA tests but not multi-generational genealogy tests.[5][6][7][8][9] In 2001, GeneTree was acquired by Sorenson Molecular Genealogy Foundation (SMGF),[10] which provided free Y-chromosome and mitochondrial DNA (mtDNA) tests.[11] GeneTree later returned to genetic testing in conjunction with its Sorenson parent company until it was acquired by Ancestry.com in 2012.[12]

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. They are transmitted from all ancestors in recent generations and so can be used to match with other testers who may be related. Companies were later also able to use this data to estimate how much of each ethnicity a customer has. FamilyTreeDNA entered this market in 2010, followed by AncestryDNA in 2012, and the number of tests grew rapidly. By 2018 autosomal testing had become the predominant type of test, and for many companies the only test they offered.[16]

MyHeritage launched its testing service in 2016, allowing users to use cheek swabs to collect samples,[17] and introduced new analysis tools in 2019: autoclusters (grouping matches visually into clusters)[18] and family tree theories (suggesting conceivable relations between DNA matches by combining several MyHeritage trees and the Geni global family tree).[19] Living DNA, founded in 2015, uses SNP chips to provide reports on autosomal ancestry, Y, and mtDNA ancestry.[20][21]

By 2019, the combined total of customers at the four largest companies was 26 million.[22][23][14][15] By August 2019, it was reported that about 30 million people had had their DNA tested for genealogical purposes.[24][22]

GEDmatch said in 2018 that about half of their one million profiles were American.[25] Due to the limited geographical distribution of DNA tests, there is inherent racism in the databases and results. The CEO of 23andME, Anne Wojcicki, said in 2020 that her company is "part of the problem."[26] Experts in genetics and health inequities believe the inherent racism of these DNA analyses can be addressed by building diverse ethnocultural teams and encouraging Black, Indigenous and People of Color to get their DNA tested.[26]

Genetic genealogy revolution

The publication of The Seven Daughters of Eve by Sykes in 2001, which described the seven major haplogroups of European ancestors, helped push personal ancestry testing through DNA tests into wide public notice. With the growing availability and affordability of genealogical DNA testing, genetic genealogy as a field grew rapidly. By 2003, the field of DNA testing of surnames was declared officially to have "arrived" in an article by Jobling and Tyler-Smith in Nature Reviews Genetics.[27] The number of firms offering tests, and the number of consumers ordering them, rose dramatically.[28] In 2018, a paper in Science Magazine estimated that a DNA genealogy search on anybody of European descent would result in a third cousin or closer match 60% of the time.[29]

Genographic Project

Main page: Biology:Genographic Project

The original Genographic Project was a five-year research study launched in 2005 by the National Geographic Society and IBM, in partnership with the University of Arizona and Family Tree DNA. Its goals were primarily anthropological. The project announced that by April 2010 it had sold more than 350,000 of its public participation testing kits, which test the general public for either twelve STR markers on the Y chromosome or mutations on the HVR1 region of the mtDNA.[30]

The phase of the project in 2016 was Geno 2.0 Next Generation.[31] As of 2018, almost one-million participants in over 140 countries had joined the project.[32]

Typical customers and interest groups

Genetic genealogy has enabled groups of people to trace their ancestry even though they are not able to use conventional genealogical techniques. This may be because they do not know one or both of their birth parents or because conventional genealogical records have been lost, destroyed or never existed. These groups include adoptees, foundlings, Holocaust survivors, GI babies, child migrants, descendants of children from orphan trains and people with slave ancestry.[33][34]

The earliest test takers were customers most often those who started with a Y-chromosome test to determine their father's paternal ancestry. These men often took part in surname projects. The first phase of the Genographic Project brought new participants into genetic genealogy. Those who tested were as likely to be interested in direct maternal heritage as their paternal. The number of those taking mtDNA tests increased. The introduction of autosomal SNP tests based on microarray chip technology changed the demographics. Women were as likely as men to test themselves.

Citizen science and ISOGG

Members of the genetic genealogy community have been credited with making useful contributions to knowledge in the field, an example of citizen science.[35]

One of the earliest interest groups to emerge was the International Society of Genetic Genealogy (ISOGG). Their stated goal is to promote DNA testing for genealogy.[36] Members advocate the use of genetics in genealogical research and the group facilitates networking among genetic genealogists.[37] Since 2006 ISOGG has maintained the regularly updated ISOGG Y-chromosome phylogenetic tree.[37][38] ISOGG aims to keep the tree as up-to-date as possible, incorporating new SNPs.[39] However, the tree has been described by academics as not completely academically verified, phylogenetic trees of Y chromosome haplogroups.[40]

Uses

Direct maternal lineages

Further information: Genealogical DNA Test - Mitochondrial DNA (mtDNA) testing

mtDNA testing involves sequencing at least part of the mitochondria. The mitochondria is transmitted from mother to child, and so can reveal information about the direct maternal line. When two individuals have matching or near mitochondria, it can be inferred that they share a common maternal-line ancestor at some point in the recent past.[41]

Direct paternal lineages

Further information: Genealogical DNA Test - Y-Chromosome DNA (Y-DNA) testing

Y-Chromosome DNA (Y-DNA) testing involves short tandem repeat (STR) and, sometimes, single nucleotide polymorphism (SNP) testing of the Y-Chromosome, which is present only in males and only reveals information on the strict-paternal line. As with the mitochondria, close matches with individuals indicate a recent common ancestor. Because surnames in many cultures are transmitted down the paternal line, this testing is often used by surname DNA projects.[42]

While early studies using STRs made bold claims that large numbers of men descend from prominent historical individuals (e.g. Niall of the Nine Hostages and Genghis Khan), more recent SNP studies have shown many of these to be invalid. In particular, STR mutations are now known to be largely unreliable in proving kinship, as these mutations can appear in multiple unrelated lineages by chance. SNP testing is necessary to prove a true relationship, as these mutations are considered so rare that they could only have arisen in one individual in history. In the few cases where the same SNP mutation occurs in different lineages, the accompanying SNPs ensure its recognition as a de novo mutation.

Pedigree family trees

Pedigree family trees have traditionally been prepared from recollections of individuals about their parents and grandparents. These family trees may be extended if recollections of earlier generations were preserved through oral tradition or written documents. Some genealogists regard oral tradition as myths unless confirmed[43] with written documentation like birth certificates, marriage certificates, census reports, headstones, or notes in family bibles.[44] Few written records are kept by illiterate populations, and many documents have been destroyed by warfare or natural disasters. DNA comparison may offer an alternative means of confirming family relationships of biological parents, but may be confused by adoption or when a mother conceals the identity of the father of her child.[45]

While mitochondrial and Y-chromosome DNA matching offer the most definitive confirmation of ancestral relationships, the information from a tested individual is relevant to a decreasing fraction of their ancestors from earlier generations. Potential ambiguity must be considered when seeking confirmation from comparison of autosomal DNA. The first source of ambiguity arises from the underlying similarity of every individual's DNA sequence. Many short gene segments will be identical by coincidental recombination (Identical by State: IBS) rather than inheritance from a single ancestor (Identical by Descent: IBD). Segments of greater length offer increased confidence of a shared ancestor. A second source of ambiguity results from the random distribution of genes to each child of a parent. Only identical twins inherit exactly the same gene segments. Although a child inherits exactly half of their DNA from each parent, the percentage inherited from any given ancestor in an earlier generation (with the exception of X chromosome DNA) varies within a normal distribution around a median value of 100% divided by the number of ancestors in that generation. An individual comparing autosomal DNA with ancestors of successively earlier generations will encounter an increasing number of ancestors from whom they inherited no DNA segments of significant length. Since individuals inherit only a small portion of their DNA from each of their great-grandparents, cousins descended from the same ancestor may not inherit the same DNA segments from that ancestor. All descendants of the same parent or grandparent, and nearly all descendants of the same great-grandparent, will share gene segments of significant length; but approximately 10% of 3rd cousins, 55% of 4th cousins, 85% of 5th cousins, and more than 95% of more distant cousins will share no gene segments of significant length. Failure to share a gene segment of significant length does not disprove the shared ancestry of a distant cousin.[46]

The best autosomal DNA method for confirming ancestry is to compare DNA with known relatives. A more complicated task is using a DNA database to identify previously unknown individuals who share DNA with the individual of interest; and then attempting to find shared ancestors with those individuals.[47] The first problem with the latter procedure involves the relatively poor family history knowledge of most database populations. A significant percentage of individuals in many DNA databases have done DNA testing because they are uncertain of their parentage, and many who confidently identify their parents are unable or unwilling to share information about earlier generations. It may be easier to identify a shared ancestor in the fortunate situation of shared DNA between two individuals with comprehensive family trees, but finding multiple shared ancestors raises the question of from which of those ancestors was the shared segment inherited. Resolving that ambiguity typically requires finding a third individual sharing both the ancestor and the gene segment of interest.[48]

Ancestral origins

A common component of many autosomal tests is a prediction of biogeographical origin, often called ethnicity. A company offering the test uses computer algorithms and calculations to make a prediction of what percentage of an individual's DNA comes from particular ancestral groups. A typical number of populations is at least 20. Despite this aspect of the tests being heavily promoted and advertised, many genetic genealogists have warned consumers that the results may be inaccurate, and at best are only approximate.[49]

Modern DNA sequencing has identified various ancestral components in contemporary populations. A number of these genetic elements have West Eurasian origins. They include the following ancestral components, with their geographical hubs and main associated populations:

# West Eurasian component Geographical hub Peak population Notes
1 Ancestral North Indian Bangladesh, North India, Pakistan Bangladeshis, North Indians, Pakistanis Main West Eurasian component in the Indian subcontinent. Peaks among Indo-European-speaking caste populations in the northern areas, but also found at significant frequencies among some Dravidian-speaking caste groups. Associated with either the arrival of Indo-European speakers from West Asia or Central Asia between 3,000 and 4,000 years before present, or with the spread of agriculture and West Asian crops beginning around 8,000-9,000 ybp, or with migrations from West Asia in the pre-agricultural period. Contrasted with the indigenous Ancestral South Indian component, which peaks among the Onge Andamanese inhabiting the Andaman Islands.[50][51]
2 Arabian Arabian peninsula Yemenis, Saudis, Qataris, Bedouins Main West Eurasian component in the Persian Gulf region. Most closely associated with local Arabic, Semitic-speaking populations.[52] Also found at significant frequencies in parts of the Levant, Egypt and Libya.[52][53]
3 Coptic Nile Valley Copts, Beja, Afro-Asiatic Ethiopians, Sudanese Arabs, Nubians Main West Eurasian component in Northeast Africa.[54] Roughly equivalent with the Ethio-Somali component.[54][55] Peaks among Egyptian Copts in Sudan. Also found at high frequencies among other Afro-Asiatic (Hamito-Semitic) speakers in Ethiopia and Sudan, as well as among many Nubians. Associated with Ancient Egyptian ancestry, without the later Arabian influence present among modern Egyptians. Contrasted with the indigenous Nilo-Saharan component, which peaks among Nilo-Saharan- and Kordofanian-speaking populations inhabiting the southern part of the Nile Valley.[54]
4 Ethio-Somali Horn of Africa Somalis, Afars, Amhara, Oromos, Tigrinya Main West Eurasian component in the Horn.[55] Roughly equivalent with the Coptic component.[54][55] Associated with the arrival of Afro-Asiatic speakers in the region during antiquity. Peaks among Cushitic- and Ethiopian Semitic-speaking populations in the northern areas. Diverged from the Maghrebi component around 23,000 ybp, and from the Arabian component about 25,000 ybp. Contrasted with the indigenous Omotic component, which peaks among the Omotic-speaking Ari ironworkers inhabiting southern Ethiopia.[55]
5 European Europe Europeans Main West Eurasian component in Europe. Also found at significant frequencies in adjacent geographical areas outside of the continent, in Anatolia, the Caucasus, the Iranian plateau, and parts of the Levant.[52]
6 Levantine Near East, Caucasus Druze, Lebanese, Cypriots, Syrians, Jordanians, Palestinians, Armenians, Georgians, Sephardic Jews, Ashkenazi Jews, Iranians, Turks, Sardinians, Adygei Main West Eurasian component in the Near East and Caucasus. Peaks among Druze populations in the Levant. Found amongst local Afro-Asiatic, Indo-European, Caucasus and Turkish speakers alike. Diverged from the European component around 9,100-15,900 ybp, and from the Arabian component about 15,500-23,700 ypb. Also found at significant frequencies in Southern Europe as well as parts of the Arabian peninsula.[52]
7 Maghrebi Northwest Africa Berbers, Maghrebis, Sahrawis, Tuareg Main West Eurasian component in the Maghreb. Peaks among the Berber (non-Arabized) populations in the region.[53] Diverged from the Ethio-Somali/Coptic, Arabian, Levantine and European components prior to the Holocene.[53][55]

Human migration

Main page: Biology:Human migration

Genealogical DNA testing methods have been used on a longer time scale to trace human migratory patterns. For example, they determined when the first humans came to North America and what path they followed.

For several years, researchers and laboratories from around the world sampled indigenous populations from around the globe in an effort to map historical human migration patterns. The National Geographic Society's Genographic Project aims to map historical human migration patterns by collecting and analyzing DNA samples from over 100,000 people across five continents. The DNA Clans Genetic Ancestry Analysis measures a person's precise genetic connections to indigenous ethnic groups from around the world.[56]

Law enforcement

Further information: Investigative genetic genealogy

Law enforcement may use genetic genealogy to track down perpetrators of violent crimes such as murder or sexual assault and they may also use it to identify deceased individuals. Initially genetic genealogy sites GEDmatch and Family Tree DNA allowed their databases to be used by law enforcement and DNA technology companies [57][58] to do DNA testing for violent criminal cases and genetic genealogy research at the request of law enforcement. This investigative, or forensic, genetic genealogy technique became popular after the arrest of the alleged Golden State Killer in 2018,[59] but has received significant backlash from privacy experts.[60][61] However, in May 2019 GEDmatch made their privacy rules more restrictive, thereby reducing the incentive for law enforcement agencies to use their site.[62][63] Other sites such as Ancestry.com, 23andMe and MyHeritage have data policies that say that they would not allow their customer data to be used for crime solving without a warrant from law enforcement as they believed it violated users' privacy.[64][65]

See also

Main page: Biology:List of genetic genealogy topics


References

  1. ↑ Darwin, George H. (Sep 1875). "Note on the Marriages of First Cousins". Journal of the Statistical Society of London 38 (3): 344–348. doi:10.2307/2338771. https://zenodo.org/record/1449464. 
  2. ↑ "Slavery at Jefferson's Monticello: The Paradox of Liberty, 27 January 2012 – 14 October 2012". Smithsonian Institution. http://americanhistory.si.edu/exhibitions/exhibition.cfm?key=38&exkey=1669. "The [DNA] test results show a genetic link between the Jefferson and Hemings descendants: A man with the Jefferson Y chromosome fathered Eston Hemings (born 1808). While there were other adult males with the Jefferson Y chromosome living in Virginia at that time, most historians now believe that the documentary and genetic evidence, considered together, strongly support the conclusion that [Thomas] Jefferson was the father of Sally Hemings's children." 
  3. ↑ Kennett, Debbie (2018-03-14). "Farewell to Oxford Ancestors". https://cruwys.blogspot.com/2018/03/farewell-to-oxford-ancestors.html. 
  4. ↑ Sykes, Bryan; Irven, Catherine (2000). "Surnames and the Y Chromosome". The American Journal of Human Genetics 66 (4): 1417–1419. doi:10.1086/302850. PMID 10739766. 
  5. ↑ Belli, Anne (January 18, 2005). "Moneymakers: Bennett Greenspan". Houston Chronicle. http://www.chron.com/business/article/Moneymakers-Bennett-Greenspan-1657195.php. "Years of researching his family tree through records and documents revealed roots in Argentina, but he ran out of leads looking for his maternal great-grandfather. After hearing about new genetic testing at the University of Arizona, he persuaded a scientist there to test DNA samples from a known cousin in California and a suspected distant cousin in Buenos Aires. It was a match. But the real find was the idea for Family Tree DNA, which the former film salesman launched in early 2000 to provide the same kind of service for others searching for their ancestors." 
  6. ↑ National Genealogical Society Quarterly. 93. National Genealogical Society. 2005. p. 248. "Businessman Bennett Greenspan hoped that the approach used in the Jefferson and Cohen research would help family historians. After reaching a brick wall on his mother's surname, Nitz, he discovered and Argentine researching the same surname. Greenspan enlisted the help of a male Nitz cousin. A scientist involved in the original Cohen investigation tested the Argentine's and Greenspan's cousin's Y chromosomes. Their haplotypes matched perfectly.". 
  7. ↑ Lomax, John Nova (April 14, 2005). "Who's Your Daddy?". Houston Press. http://www.houstonpress.com/2005-04-14/news/who-s-your-daddy/. "A real estate developer and entrepreneur, Greenspan has been interested in genealogy since his preteen days." 
  8. ↑ Dardashti, Schelly Talalay (March 30, 2008). "When oral history meets genetics". The Jerusalem Post. http://www.jpost.com/Features/In-Thespotlight/When-oral-history-meets-genetics. "Greenspan, born and raised in Omaha, Nebraska, has been interested in genealogy from a very young age; he drew his first family tree at age 11." 
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  15. ↑ 15.0 15.1 Janzen, Tim. "Family Tree DNA Learning Center". Autosomal DNA testing comparison chart. Gene by Gene. https://isogg.org/wiki/Autosomal_DNA_testing_comparison_chart. 
  16. ↑ Southard, Diahan (2018-04-25). "The Top 5 Autosomal DNA Tests of 2018" (in en-US). https://www.familytreemagazine.com/premium/top-5-autosomal-dna-tests-2018/. 
  17. ↑ Lardinois, Frederic (7 November 2016). "MyHeritage launches DNA testing service to help you uncover your family's history". TechCrunch. https://techcrunch.com/2016/11/07/myheritage-launches-dna-testing-service-to-help-you-uncover-your-familys-history/. 
  18. ↑ "Introducing AutoClusters for DNA Matches". 2019-02-28. https://blog.myheritage.com/2019/02/introducing-autoclusters-for-dna-matches/. 
  19. ↑ "MyHeritage's "Theory of Family Relativity": An Exciting New Tool!" (in en-US). 2019-03-15. https://www.danaleeds.com/myheritages-theory-of-family-relativity-an-exciting-new-tool/. 
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  23. ↑ "Continued Commitment to Customer Privacy and Control". November 2, 2017. https://blogs.ancestry.com/ancestry/2017/11/02/continued-commitment-to-customer-privacy-and-control/. 
  24. ↑ Farr, Christina (2019-08-25). "Consumer DNA testing has hit a lull — here's how it could capture the next wave of users" (in en). https://www.cnbc.com/2019/08/25/dna-tests-from-companies-like-23andme-ancestry-see-sales-slowdown.html. 
  25. ↑ Michaeli, Yarden (2018-11-16). "To Solve Cold Cases, All It Takes Is Crime Scene DNA, a Genealogy Site and High-speed Internet" (in en). Haaretz. https://www.haaretz.com/us-news/.premium.MAGAZINE-to-solve-cold-cases-all-it-takes-is-dna-a-genealogy-site-and-high-speed-internet-1.6657176. 
  26. ↑ 26.0 26.1 "Geneticists weigh in on how 23andMe can tackle racial inequity in the field" (in en-US). 2020-06-10. https://www.statnews.com/2020/06/10/23andme-ancestry-racial-inequity-genetics/. 
  27. ↑ Jobling, Mark A.; Tyler-Smith, Chris (2003). "The human Y chromosome: An evolutionary marker comes of age". Nature Reviews Genetics 4 (8): 598–612. doi:10.1038/nrg1124. PMID 12897772. 
  28. ↑ Deboeck, Guido. "Genetic Genealogy Becomes Mainstream". BellaOnline. http://www.bellaonline.com/articles/art12474.asp. 
  29. ↑ Erlich, Yaniv; Shor, Tal; Pe'er, Itsik; Carmi, Shai (2018-11-09). "Identity inference of genomic data using long-range familial searches" (in en). Science 362 (6415): 690–694. doi:10.1126/science.aau4832. ISSN 0036-8075. PMID 30309907. Bibcode: 2018Sci...362..690E. 
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  32. ↑ "National Geographic Geno DNA Ancestry Kit | Human Migration, Population Genetics". https://genographic.nationalgeographic.com/. 
  33. ↑ How African Americans Use DNA Testing to Connect With Their Past
  34. ↑ Utilizing DNA testing to break through adoption roadblocks
  35. ↑ Redmonds, George; King, Turi; Hey, David (2011). Surnames, DNA, and Family History. Oxford: Oxford University Press. p. 196. ISBN 9780199582648. https://books.google.com/books?id=tQRMzEcIb2gC. "The growth of interest in genetic genealogy has inspired a group of individuals outside the academic area who are passionate about the subject and who have an impressive grasp of the research issues. Two focal points for this group are the International Society of Genetic Genealogy and the Journal of Genetic Genealogy. The ISOGG is a non-profit, non-commercial organization that provides resources and maintains one of the most up-to-date, if not completely academically verified, phylogenetic trees of Y chromosome haplogroups." 
  36. ↑ "The International Society of Genetic Genealogy". http://www.isogg.org. 
  37. ↑ 37.0 37.1 King, TE; Jobling, MA (2009). "What's in a name? Y chromosomes, surnames and the genetic genealogy revolution". Trends in Genetics 25 (8): 351–360. doi:10.1016/j.tig.2009.06.003. PMID 19665817. https://figshare.com/articles/journal_contribution/10096019. 
  38. ↑ International Society of Genetic Genealogy (2006). "Y-DNA Haplogroup Tree 2006, Version: 1.24, Date: 7 June 2007". http://www.isogg.org/tree/Main06.html. 
  39. ↑ Athey, Whit (2008). "Editor's Corner: A New Y-Chromosome Phylogenetic Tree". Journal of Genetic Genealogy 4 (1): i–ii. http://www.jogg.info/41/Editorial.pdf. Retrieved July 8, 2013. "Meanwhile, new SNPs are being announced or published almost every month. ISOGG's role will be to maintain a tree that is as up-to-date as possible, allowing us to see where each new SNP fits in.". 
  40. ↑ Larmuseau, Maarten (November 14, 2014). "Towards a consensus Y-chromosomal phylogeny and Y-SNP set in forensics in the next-generation sequencing era". Forensic Science International: Genetics 15: 39–42. doi:10.1016/j.fsigen.2014.11.012. PMID 25488610. 
  41. ↑ "mtDNA Testing". Family Tree DNA. https://learn.familytreedna.com/mtdna-testing/. Retrieved 27 September 2022. 
  42. ↑ "Y-DNA STR Testing". Family Tree DNA. https://learn.familytreedna.com/y-dna-testing/. Retrieved 27 September 2022. 
  43. ↑ "Genealogy or Family History? What's the Difference?". Society of Genealogists. http://www.sog.org.uk/learn/education-sub-page-for-testing-navigation/guide-ten/. 
  44. ↑ "What Are Primary & Secondary Sources?". The Genealogy Assistant. https://www.thegenealogyassistant.com/index.php/store/three-brushes-with-death/43-news/blog-posts/314-what-are-primary-a-secondary-sources. Retrieved 26 September 2022. 
  45. ↑ "Ancestors: What Constitutes Proof?". DNAeXplained – Genetic Genealogy. 11 July 2018. https://dna-explained.com/2018/07/11/ancestors-what-constitutes-proof/. Retrieved 26 September 2022. 
  46. ↑ "DNA Relatives: Detecting Relatives and Predicting Relationships". 23andMe. https://customercare.23andme.com/hc/en-us/articles/212170958-DNA-Relatives-Detecting-Relatives-and-Predicting-Relationships. Retrieved 26 September 2022. 
  47. ↑ Janzen, Tim. "Help:DNA Ancestor Confirmation Aid". WikiTree. https://www.wikitree.com/wiki/Help:DNA_Ancestor_Confirmation_Aid. Retrieved 26 September 2022. 
  48. ↑ "Help:Triangulation". WikiTree. https://www.wikitree.com/wiki/Help:Triangulation. Retrieved 26 September 2022. 
  49. ↑ Estes, Roberta (February 10, 2016). "Ethnicity Testing — A Conundrum". https://dna-explained.com/2016/02/10/ethnicity-testing-a-conundrum/. 
  50. ↑ Priya Moorjani; Kumarasamy Thangaraj; Nick Patterson; Mark Lipson; Po-Ru Loh; Periyasamy Govindaraj; Bonnie Berger; David Reich et al. (5 September 2013). "Genetic Evidence for Recent Population Mixture in India". American Journal of Human Genetics 93 (3): 422–438. doi:10.1016/j.ajhg.2013.07.006. PMID 23932107. 
  51. ↑ Rakesh Tamang; Lalji Singh; Kumarasamy Thangaraj (November 2012). "Complex genetic origin of Indian populations and its implications". Journal of Biosciences 37 (5): 911–919. doi:10.1007/s12038-012-9256-9. PMID 23107926. http://ns1.ias.ac.in/jbiosci/nov2012/911.pdf. Retrieved 17 May 2015. 
  52. ↑ 52.0 52.1 52.2 52.3 Marc Haber; Dominique Gauguier; Sonia Youhanna; Nick Patterson; Priya Moorjani; Laura R. Botigué; Daniel E. Platt; Elizabeth Matisoo-Smith et al. (February 28, 2013). "Genome-Wide Diversity in the Levant Reveals Recent Structuring by Culture". PLOS Genetics 9 (2): e1003316. doi:10.1371/journal.pgen.1003316. PMID 23468648. 
  53. ↑ 53.0 53.1 53.2 Brenna M. Henn; Laura R. Botigué; Simon Gravel; Wei Wang; Abra Brisbin; Jake K. Byrnes; Karima Fadhlaoui-Zid; Pierre A. Zalloua et al. (January 12, 2012). "Genomic Ancestry of North Africans Supports Back-to-Africa Migrations". PLOS Genetics 8 (1): e1002397. doi:10.1371/journal.pgen.1002397. PMID 22253600. 
  54. ↑ 54.0 54.1 54.2 54.3 Begoña Dobon; Hisham Y. Hassan; Hafid Laayouni; Pierre Luisi; Isis Ricaño-Ponce; Alexandra Zhernakova; Cisca Wijmenga; Hanan Tahir et al. (28 May 2015). "The genetics of East African populations: a Nilo-Saharan component in the African genetic landscape". Scientific Reports 5: 9996. doi:10.1038/srep09996. PMID 26017457. PMC 4446898. Bibcode: 2015NatSR...5E9996D. http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC4446898&blobtype=pdf. Retrieved 13 June 2015. 
  55. ↑ 55.0 55.1 55.2 55.3 55.4 Jason A. Hodgson; Connie J. Mulligan; Ali Al-Meeri; Ryan L. Raaum (June 12, 2014). "Early Back-to-Africa Migration into the Horn of Africa". PLOS Genetics 10 (6): e1004393. doi:10.1371/journal.pgen.1004393. PMID 24921250. ; Supplementary Text S1: Affinities of the Ethio-Somali ancestry component, doi:10.1371/journal.pgen.1004393.s017 
  56. ↑ "DNA Clans (Y-Clan) - DNA Ancestry Analysis". Genebase. http://www.genebase.com/in/dnaClansPopulation.php. 
  57. ↑ "The brave new world of genetic genealogy". https://www.technologyreview.com/s/611048/the-brave-new-world-of-genetic-genealogy/. 
  58. ↑ "Body found in 1995 tentatively identified". https://www.beloitdailynews.com/news/20190228/body_found_in_1995_tentativelyidentified_. 
  59. ↑ Molteni, Megan (24 April 2019). "What the Golden State Killer tells us about Forensic Genetics". Wired. https://www.wired.com/story/the-meteoric-rise-of-family-tree-forensics-to-fight-crimes/. 
  60. ↑ Zabel, Joseph (2019-05-22). "The Killer Inside Us: Law, Ethics, and the Forensic Use of Family Genetics". Berkeley Journal of Criminal Law. 
  61. ↑ Curtis, Caitlin; Hereward, James; Mangelsdorf, Marie; Hussey, Karen; Devereux, John (December 2018). "Protecting trust in medical genetics in the new era of forensics". Genetics in Medicine 21 (7): 1483–1485. doi:10.1038/s41436-018-0396-7. PMID 30559376. 
  62. ↑ Augenstein, Seth (2019-05-20). "GEDmatch Changes Are 'Blow' to Law Enforcement – and Forensic Genealogy" (in en). https://www.forensicmag.com/news/2019/05/gedmatch-changes-blow-law-enforcement-and-forensic-genealogy. 
  63. ↑ Augenstein, Seth (2019-05-23). "Forensic Genealogy: Where Does Cold-Case Breakthrough Technique Go After GEDmatch Announcement?" (in en). https://www.forensicmag.com/news/2019/05/forensic-genealogy-where-does-cold-case-breakthrough-technique-go-after-gedmatch-announcement. 
  64. ↑ Pauly, Madison (12 March 2019). "Police Are Increasingly Taking Advantage of Home DNA Tests. There Aren't Any Regulations to Stop It.". https://www.motherjones.com/crime-justice/2019/03/genetic-genealogy-law-enforcement-golden-state-killer-cece-moore/. 
  65. ↑ Lund, Solana (2020-05-15). "Ethical Implications of Forensic Genealogy in Criminal Cases". The Journal of Business, Entrepreneurship and Law (Pepperdine University School of Law, California, USA) 13 (2): 189–192. https://digitalcommons.pepperdine.edu/jbel/vol13/iss2/6/. 

Further reading

Books

Documentaries

Jennifer Beamish (producer); Clive Maltby (director); Spencer Wells (host) (2003). The Journey of Man (DVD). Alexandria, VA: PBS Home Video. ASIN B0000AYL48. ISBN 978-0-7936-9625-3. OCLC 924430061.

Journals

External links

  • Shared cM Project – how to determine ones relationship based on Centimorgan (cM) values



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