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ies the genetic genealogist adding dna to the genealogist s toolbox the shared cm project blaine bettinger 29 may 2015 for reference here are all posts for the shared cm project most up to date post version 4 0 march 2020 update to the shared cm project march 27 2020 older posts august 2017 update to the shared cm project august 26 2017 outdated as of march 27 2020 update to the shared cm project june 26 2016 outdated as of august 2017 collecting sharing information for known relationships collecting sharing information for known relationships part ii the shared cm project an update visualizing data from the shared cm project the shared cm project longest shared segment visualizing distributions for the shared cm project click to read more genealogy looking for my x dna charts blaine bettinger 22 march 2013 8 comments interested in learning about the unique inheritance of the x chromosome through the use of some cool visual charts look no further unlocking the genealogical secrets of the x chromosome more x chromosome charts and be sure to check out debbie parker wayne s great charts at x dna inheritance charts genealogy the growing phenomenon of the unlinked family cluster blaine bettinger 16 march 2023 47 comments have you experienced this you ve identified a very clear cluster that includes numerous dna matches that all descend from a single family but you have no idea how this family links into your family tree try as you might and despite building numerous trees you can t seem to figure out how these dna matches and this single ancestral family link into your family tree if this sounds familiar you have an unlinked family cluster defining unlinked family cluster an unlinked family cluster is a very specific phenomenon in genetic genealogy one that is becoming increasingly common we see more and more of these clusters for various reasons the matching databases get larger and larger meaning that these clusters get larger and easier to identify additionally the more we work with our closest dna matches the more we have very promising left behind matches that don t fit into our known ancestry often these left behind matches form a shared match cluster or a triangulated cluster around a specific family this is an unlinked family cluster click to read more genealogy leveraging the power of siblings and cousins to narrow relationship possibilities blaine bettinger 12 november 2022 15 comments the shared cm project is a collaborative research project that uses data from 100s of genealogists to generate shared dna ranges and averages for nearly 50 different genealogical relationships the most recent version of the shared cm project version 4 0 was released on march 27 2020 i had so much free time in the early days of the pandemic see version 4 0 march 2020 update to the shared cm project keep those submissions coming i m hoping to do an update in 2023 always improving one of the enhancements to the shared cm project that has been on our minds since the creation of the project is the use of siblings and or same generation cousins to narrow down the list of possible relationships to a dna match for example my sister and are full siblings and thus by definition we have the same genealogical relationship to all of our genealogical cousins sometimes this can be a challenging concept this graphic shows how my sister sibling 1 and i sibling 2 have exactly the same genealogical relationship to this third cousin 3c click to read more genealogy enhancements to the shared cm project at dnapainter com blaine bettinger 27 august 2022 4 comments the shared cm project is a collaborative research project that uses data from 100s of genealogists to generate shared dna ranges and averages for nearly 50 different genealogical relationships the most recent version of the shared cm project version 4 0 was released on march 27 2020 i had so much free time in the early days of the pandemic see version 4 0 march 2020 update to the shared cm project several years ago jonny perl creator of the invaluable genealogical website dnapainter com graciously converted the results of the shared cm project into a dynamic online tool with this free tool a genealogist can enter an amount of dna shared in cm with a match at a testing company and the possible relationships for that shared amount will highlight in the graphic in addition clicking on any of the relationship boxes produces a pop up that reveals the histogram for that relationship arguably the most valuable aspect of the shared cm project click to read more genealogy an in depth analysis of the use of small segments as genealogical evidence blaine bettinger 7 august 2022 11 comments tl dr executive summary the size of a small segment is not strictly defined but is generally less than 10 cm and preferably less than 7 cm a very large percentage of small segments are not valid matching segments i e are false segments and our ability to distinguish valid segments from false segments is either impossible or very limited although we cannot reliability utilize a small shared segment as genealogical evidence in most cases that does not negate the potential value of a genealogical relationship there is no evidence that 1 triangulating a small segment or 2 sharing a large segment in addition to the small segment or 3 finding a shared ancestor increases the probability that a small segment is valid even if a small segment is somehow identified as valid perhaps an even bigger challenge is determining whether the small segment which can be 10 20 or more generations old came from the identified ancestral line or another known or unknown shared ancestral line small segments have long been a controversial subject in the genealogy community some love them some hate them here we will look at all the available evidence surrounding small segments some of the misconceptions associated with them and some of the ways we might be able to utilize small segments in our research what are small segments one of the biggest problems surrounding the discussion of small segments it that there is no strict definition of the term a small segment to one person might be anything 5 cm or less while a small segment to another person might be anything less than 10 cm and there are many other variations for purposes of this analysis we will define a small segment as any single segment of dna less than 8 cm although segments as high as 10 cm or more can be problematic as well click to read more genealogy losing distant matches at ancestrydna blaine bettinger 17 july 2020 51 comments during a phone call with ancestrydna representatives this week unfortunately i was not able to attend numerous genealogists heard two major announcements the ancestrydna database has hit 18 million test takers such great news and there are significant changes coming to our dna match list the announcement started to appear on the dna match list page yesterday clicking on the link brings up information about the changes the changes to the dna match list comprise the following the number of shared segments should improve from the announcement the dna you share with a match is distributed across segments short segments long segments or some combination of both our updated matching algorithm may reduce the estimated number of segments you share with some of your dna matches this doesn t change the estimated total amount of shared dna measured in centimorgans cm or the predicted relationship to your matches click to read more genealogy version 4 0 march 2020 update to the shared cm project blaine bettinger 27 march 2020 67 comments the shared cm project scp is a collaborative data collection and analysis project created to understand the ranges of shared cm associated with various known relationships the scp has been very successful with more than 60 000 submissions from amazing genealogists like you to add your data the submission portal is here i am always collecting data and hopefully the next update will have more than 100 000 submissions the full pdf for version 4 0 of the shared cm project is here and it is essential that you read the full pdf for all the details from the project the shared cm project version 4 0 march 2020 today the most recent version of the scp version 4 0 goes live i ve taken nearly 60 000 submissions and analyzed the data for almost 50 different relationships for each relationship the 100s or 1000s of submissions were analyzed to remove outliers to provide minimum maximum average and standard deviation values and to generate a histogram for the distribution of the submissions here are some of the other differences between this new version 4 0 and the previous version click to enlarge click to read more genealogy putting the milkman joke to rest blaine bettinger 25 march 2019 93 comments warning i discuss or imply violent acts by ancestors in this post read at your own risk we ve all heard it some of us have even made it a joke or implication about an affair or dalliance that conceived a child often referring to the milkman or a neighbor it s usually directed to the biological mother always ignoring or downplaying any act by the biological father and is always consensual the audience whether in a facebook forum or at a talk seminar webinar seemingly always primed for the joke laughs and the speaker moves on it s time for this joke or implication whether blatant or implied to die the ignoble death it deserves an admission a few years ago during a lecture i make a flippant remark about a misattributed parentage conception it may have been as simple as raising my eyebrows at a key moment or even a simple pause that implied meaning i don t remember after the talk an audience member came up and called me out for being flippant about misattributed parentage conceptions and the audience member was right i had been flippant i was wrong click to read more genealogy examining outliers in shared cm amounts part 2 blaine bettinger 21 march 2019 18 comments in this blog post we will briefly review an extreme grandparent grandchild relationship where a grandchild appears to share just 9 of her dna with a paternal grandmother rather than the expected 25 all information is anonymized i m a little afraid to post this article about an extreme outlier scenario there is a danger that it could support misinterpretation rather than foster critical thinking if you have a possible outlier scenario be sure to try to disprove that it is an outlier situation rather than simply proceeding as if is an outlier avoid confirmation bias this is the third post on my blog specifically examining outliers in confirmed relationships analyzing a lack of sharing in 2c1r relationship examining outliers in shared cm amounts is it an outlier the extreme danger of confirmation bias this was discussed in a previous article about outliers but it bears repeating click to read more genealogy new tools everywhere exploring the new tools at myheritage and ancestrydna blaine bettinger 12 march 2019 10 comments the annual rootstech convention at salt lake city in february has become a showcase for new tests and tools offered by the dna testing companies the biggest winner of all of course is the consumer both ancestrydna and myheritage announced major new developments at this year s rootstech for example ancestrydna announced mytreetags new improved dna matches and thrulines three different tools currently in beta the first two require an opt in while everyone is currently eligible for thrulines meanwhile myheritage announced theory of family relativity and autocluster both of which are currently available to members of their dna database there is a lot to digest with these tools including knowing how to use them and understanding their limitations to help you understand what the tools are and how to use them i ve created two new youtube videos click to read more genealogy examining outliers in shared cm amounts blaine bettinger 17 december 2018 19 comments sheryl a member of the genetic genealogy tips techniques group which just broke 50 000 members recently commented on a thread about shared dna outliers about a situation within her own family i thought it would be a great opportunity to discuss outliers and how to deal with them sheryl kindly agreed for background we examined an outlier situation once before on this blog where second cousins once removed 2c1r did not share dna see analyzing a lack of sharing in 2c1r relationship identifying an outlier sheryl indicated that she and her mother grace appeared to be outliers with sally their first cousin 1c and first cousin once removed 1c1r respectively grace shared 482 cm with her 1c sally and sheryl shared 215 cm with her 1c1r sally not surprisingly grace and sheryl share an expected amount for mother daughter click to read more genealogy previous articles about the genetic genealogist the genetic genealogist examines the intersection of traditional genealogical techniques and modern genetic research the blog also explores the latest news and developments in the related field of personal genomics my books recent posts the growing phenomenon of the unlinked family cluster leveraging the power of siblings and cousins to narrow relationship possibilities enhancements to the shared cm project at dnapainter com an in depth analysis of the use of small segments as genealogical evidence losing distant matches at ancestrydna recent comments janna on the growing phenomenon of the unlinked family cluster robert on the growing phenomenon of the unlinked family cluster patrick on the growing phenomenon of the unlinked family cluster lona laackmann wacker on the growing phenomenon of the unlinked family cluster doug elerath on the growing phenomenon of the unlinked family cluster mastodon mastodon 2026 the genetic genealogist all rights reserved flato by themememe this website uses cookies to improve your experience click to accept or opt out 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