How do Results Look and What do They Mean?

Example Results for a Person of African-American Ancestry

Comments for this sample individual: These sample results are for a person of African-American descent. To view a sample of results in high resolution PDF format, please click here



Part A: Genetic Profile: Your unique genetic profile includes the values for 26 genetic markers distributed throughout your autosomal chromosomes. For each marker (also known as a “locus”) you have two values (“alleles”): one inherited from your father and the other inherited from your mother, for a total of 52 dimensions used to perform your DNA Tribes’ ancestry testing. More specifically, your unique combination of alleles is used to compute high resolution Native Population, Global Population and World Region matches.



Locus Genetic Markers Sample Results for a person of African-American descent

Comments for this sample individual: At each locus, this individual inherited one allele value from their mother and one from their father. Each allele value is a number representing repeats of a particular genetic sequence. For instance, at locus THO1, this individual has inherited one allele of length 7 (7 repeats) and one allele of length 9.3 (9.3 repeats). Because these alleles are passed down independently on separate chromosomes, it would be necessary to test a parent to determine which allele was passed down by which parent. This DNA profile serves as a genetic fingerprint for this person, and this collection of allele values is used to compute this person’s connections to individual populations and World Regions in the DNA Tribes’ reference database.



Part B: High Resolution Native Population Match: DNA Tribes identifies your Top 20 matches in our reference database of more than 900 native populations that have experienced minimal movement and admixture in the last 500 years. Individual population matches do not necessary indicate recent social or cultural affiliation with a particular ethnicity. Instead, the geographical distribution of your Native Population Match results indicates your most likely deep ancestral origins.



DNA matches do not necessarily suggest a recent family ancestor from each country listed and can express the genetic traces of more ancient relationships between populations through shared origins, migrations, and long term trade contacts in each part of the world. For people with mixed ancestry, DNA matches can also identify populations where similar mixing has taken place (such as native populations located near historical trade and migration routes between continents).



Satellite heat markers for Sample results of person with african-american descent

Key to map with heat markers for sample results of a person with african-american descent

Comments for this sample individual: The Top 20 Native population matches for this individual include several indigenous African nations and tribes in our database. The listed individual MLI scores do not indicate the percentage of individual’s genetic material attributable to individual populations. Instead, these MLI scores assess the relative likelihood of this person’s genetic make-up occurring in a particular population:



  • The strongest match is with a Tanzanian population where this individual’s DNA profile is 17,822,172 times more likely to occur than in the world as a whole. The TribeScore of (0.50) indicates this MLI score is higher than 50% of MLIs for sampled Tanzanian individuals; thus, this individual’s genetic make-up is quite common in this Tanzanian population.


  • However, similar DNA profiles can be found in other native African populations: the MLI score of 13,549,274 for Angola indicates that this example DNA profile is 17,822,172 / 13,549,274 = 1.3 times more likely in Tanzania than in Angola. For both populations, the TribeScores are within the expected range of (0.25) or above which indicates this person's DNA fits well within the genetic range for members of both populations.



In summary, Tanzania would be this person's most likely population of origin, but other ancestral origins such as Angola or Ovambo Bantu cannot be excluded. Because no population is completely isolated from its neighbors and African American (and African Diaspora) communities have origins from multiple tribes of Africa, individual DNA profiles often match a number of populations at similar likelihoods. These genetic matches provide strong clues as to where (1) this person’s ancestors left the strongest genetic traces and (2) their genetic relatives in Africa live today. These modern DNA matches can include the source populations of the African Diaspora during the recent colonial period, as well as pre-European migrations within Africa (such as the Bantu migrations).



Note: Some African nations appear multiple times in the Top 20 (e.g., multiple matches for Angola and Nigeria are listed). This is due to multiple population samples available for each nation and each MLI score represents an independent comparison of an individual’s DNA to a particular sample.



Part C: High Resolution Global Population Match: In this section we provide your Top 20 matches in the DNA Tribes database of all populations, including native peoples as well as Diaspora groups that expanded from their homelands and sometimes admixed with other populations in recent history. The geographical distribution of these matches indicates your closest genetic relatives today and the world communities where the genetic material you have inherited is shared.



Satellite heat markers for Sample results of person with african-american descent

Key to map with heat markers for sample results of a person with african-american descent

Comments for this sample individual: These Global match results include not just native African populations but also populations of the African Diaspora. For instance, this individual’s DNA profile can be found at high frequencies in modern communities of African descent living in many places, including the United States, Caribbean, and the United Kingdom. Global matches do not imply that this individual’s ancestors came from the Caribbean, but do identify places where individuals with a similar genetic background live today.



Part D: High Resolution World Region Match World Region matches measure your genetic connections to major genetic World Regions identified by DNA Tribes using proprietary statistical algorithms. Each World Region is comprised of multiple populations that are geographically adjacent and genetically similar.



Satellite heat markers for Sample results of person with african-american descent

Key to map with heat markers for sample results of a person with african-american descent

Comments for this sample individual: World Region results provide the most robust assessment of the person’s genetic connections to the world. They can often clarify individual Native and Global population match results. For instance, this sample individual’s DNA profile is most frequent in the Tropical West African World Region (the highest MLI score) and slightly less common in the African Great Lakes World Region (the second highest MLI score). More precisely, this individual’s DNA profile is most frequent in the Tropical West African World Region, where it is 2,501,605 times more likely to occur than in the world as a whole. This individual’s second highest match is with the African Great Lakes World Region (MLI of 1,369,325). Hence, this individual’s genetic make-up is 2,501,605 / 1,369,325 = 1.8 times more likely to occur in the Tropical West African World Region than in the African Great Lakes World Region.



In addition for this individual substantial MLI scores include other African and Middle Eastern World Regions (e.g., Sahelian and Arabian respectively). These secondary affiliations indicate that this example African American DNA profile can also be found with much lower likelihood in other World Regions.



Summary Comments:DNA Tribes results for this person provide a detailed and comprehensive picture of their African-American ancestry including their closest genetic relatives amongst ethnic groups in both Africa and the modern African Diaspora populations as well as detailed information about other world populations where their genetic material is common.