Thursday, March 5, 2026
23andMe Chromosome Segment Sharing
Wednesday, December 24, 2025
Ancestry Timeline Feature
Thursday, December 18, 2025
Ceramic Age Caribbean Matches
As we should have done at the beginning, we finally went back and re-read the reference study (Fernandes et al.) used by 23andMe for their indigenous Caribbean references. As expected, our Matches are to Ceramic Age samples from sites in Hispaniola (mostly eastern), Puerto Rico, and Bahamas. Our historical matches fell into the following major groups based on the above study's analysis of the genomes of ancient Antillean peoples:
Haiti Ceramic: 2 matches
Bahamas Ceramic: 2 Matches
SECoast DR Ceramic: 11 Matches
Eastern Greater Antilles Ceramic: 11 matches
The overwhelming number of matches (although mostly small) are with what the study terms Southeast Coast DR groups and Eastern Greater Antilles (which includes samples from Puerto Rico and the eastern Dominican Republic). This matching pattern is to be expected given the Ceramic Age population largely replacing Archaic lineages and the pattern of close relatives from different sites on Hispaniola or genetic matches between individuals from other islands. To what extent this pattern was also due to relatively small population sizes in Hispaniola and Puerto Rico is another mystery. We have always tended to prefer somewhat higher population numbers for Puerto Rico and Hispaniola in pre-Columbian times based on Moscoso's analysis of Puerto Rico.
We also found it cool that some of our larger matches were to the two Individuals in the Haiti Ceramic clade. These two individuals were related and harbored significant Archaic ancestry from groups on the island before the Saladoid or Arawakan expansion to the Greater Antilles (unless we are already outdated in our terminology here). We matched the two ancient Haitians from Diale for approximately the same amount of total shared cM on 2 segments. It would be interesting if part of that shared ancestry was from the earlier, Archaic population.
Wednesday, November 19, 2025
23andme Sub-Saharan Africa Update
Saturday, October 18, 2025
Les Gaulois (2025)
Saturday, October 11, 2025
Haitian African Updates (2025)
Saturday, May 31, 2025
French and European Matches
Thursday, May 22, 2025
"Berber" Ancestry
A feature Ancestry and 23andme must (re)introduce is a chromosome browser that shows the user where exactly their DNA matches another user's. MyHeritage, which is less accurate, already offers this feature for free. However, since their DNA estimates are less accurate, we are forced to use DNA Painter's features to copy the chromosome breakdowns from 23andme or Ancestry to see the assigned "ethnicity" for sections of each chromosome. This convoluted process creates more work, and should be something available for free on Ancestry and 23andme. Doing so would illuminate how exactly one shares DNA with other users. This feature on My Heritage shows us, for instance, where we share DNA with North Africans. In the above example, with someone of Algerian heritage, we share 9.3 cM of DNA on a section of my third chromosome assigned to "North African" by Ancestry. This suggests that we likely harbor small amounts of "Amazigh" ancestry that can still be matched with random people from Morocco and Algeria. In our case, since we do not know of any recent admixture, we assume this is from one (or two) of 2 scenarios: ancient "Guanche" admixture from ancestors who came to the Caribbean via the Canary Islands or via ancient "Berber" admixture in parts of the Iberian Peninsula which contributed to the early peopling of the Spanish Caribbean. Either way, the fact that we have found multiple matches who share segments of DNA on parts of our chromosomes assigned to "North Africa" suggests "Berber" admixture. We need this feature to facilitate understanding of our West and Central African matches from places like Ghana, Nigeria, Sierra Leone, and other countries. It would also be very useful when looking at matches who are a mix of different African nationalities.
Wednesday, May 21, 2025
North African Ancestry Via Chromosome Painting
Monday, April 28, 2025
Ghana, Togo and Benin
Tuesday, April 22, 2025
Shared African Matches
Thursday, October 17, 2024
Caribbean Ancient DNA...
Tuesday, October 27, 2020
Brief Thoughts on "Taino DNA" and Caribbean Indigeneity
Tuesday, August 8, 2017
Native American DNA
Kim TallBear’s Native American DNA scrutinizes DNA and genetic science in the context of race and indigeneity. According to TallBear, many tribes are increasingly using DNA tests for membership in tribal rolls in addition to blood quantum. With that as a point of departure, the author borrows from feminist Donna Haraway, Aura Simpson’s ethnographic refusal, and Linda Tuwihai Smith’s decolonizing methodologies to unpack the ways in which genetic science perpetuates racialization and white domination. Indeed, TallBear’s study is more of an anthropology of white people, reversing the ethnographic gaze. She also adds nuance to the ways in which blood quantum became part of tribal membership, beginning with the 1887 Dawes act. Despite being impose from above, Indian input on who should be a member shaped how federal agents completed the allotment process. Furthermore, her nuanced discussion of blood as a sign of lineal descent, or genealogic tribalism, helps elucidate why blood quantum persists.














