tag:blogger.com,1999:blog-7238849140976286627.post2571240999903919604..comments2024-03-08T15:43:54.700+00:00Comments on Cruwys news: Parent and child comparisons at MyHeritage DNADebbie Kennetthttp://www.blogger.com/profile/11573470282571579765noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-7238849140976286627.post-42168152513435758322017-07-29T15:29:35.846+01:002017-07-29T15:29:35.846+01:00Anna
It is still very difficult with the current ...Anna<br /><br />It is still very difficult with the current matching algorithms to draw conclusions about matches much beyond the fourth or fifth cousin level. All the companies are delivering quite a lot of false positive matches though MyHeritage have by far and away the worst rate at present. However, I have faith that they will make improvements in the near future.Debbie Kennetthttps://www.blogger.com/profile/11573470282571579765noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-62163615957385692032017-07-29T00:10:31.362+01:002017-07-29T00:10:31.362+01:00Debbie
Thank you for the tip about excluding smal...Debbie<br /><br />Thank you for the tip about excluding small segments - I'll try it out.<br /><br />I had expected that Finnish would be a proxy for Estonian - they are linked historically and have very similar non Indo-European languages, though no doubt Estonians are more mixed genetically, as they were less isolated geographically.<br /><br />I have several matches with Finns, but as they are scattered over quite a wide area, I'm inclined to think think they are false positives.<br /><br />AnnaAnonymoushttps://www.blogger.com/profile/01640182924760580357noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-57258239800705001592017-07-27T23:31:46.274+01:002017-07-27T23:31:46.274+01:00Jules
Once we get back beyond about five or six g...Jules<br /><br />Once we get back beyond about five or six generations there's a much greater possibility that we will find ancestors to whom we're related in multiple ways as a result of cousin marriages. There was a very small founding population in Colonial America and that seems to have created a bottleneck in the first 200 years of settlement. It does seem to be the case that most Americans with Colonial ancestry are related to each other in multiple ways in a fairly recent timeframe. You can see this with their shaky leaf hints at AncestryDNA. Sometimes they can have five more possible ancestral couples highlighted for a single DNA match!Debbie Kennetthttps://www.blogger.com/profile/11573470282571579765noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-43371460893393363352017-07-27T18:29:37.213+01:002017-07-27T18:29:37.213+01:00Anna
I don't think you can read too much into...Anna<br /><br />I don't think you can read too much into these admixture percentages. I don't believe there are any reference samples from Estonia so you're being matched against other European samples instead. The Finns were historically a genetic isolate so Finnish DNA does usually show up but perhaps Finnish in your case is serving as a proxy for Estonian. The Native American is probably just noise. It's best to focus on your matches and look at their genealogies rather than making inferences from your MyOrigins results.<br /><br />The FTDNA relationship predictions are just as much of a problem. FTDNA include small segments under 5 cMs to make the relationship predictions. Most of these small segments are false matches but they have the effect of falsely inflating the cM count. You'll get more realistic estimates if you recalculate the numbers and exclude the small segments.Debbie Kennetthttps://www.blogger.com/profile/11573470282571579765noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-63864911785879004722017-07-27T18:26:29.735+01:002017-07-27T18:26:29.735+01:00I once started researching an American match with ...I once started researching an American match with surnames that are very specific to my ancestral area, she was a match to my mother. As I suspected her family emigrated. I started making a tree for the match, focusing on surnames and villages that are known in my ancestry, I ended up linking her to my tree, but I did it through my father's ancestry; but she wasn't even a match for him, so I went on working through other lines.<br /><br />I did eventually find a link to my mother's side of the family, but because I think any family from this area that has been there for the last 400+ years is probably endogamous, she's probably related to my parents on multiple lines too, so I don't know if the particular shared ancestor is the ancestor related to the shared segment.Jules van Laarhttps://www.blogger.com/profile/10730263111027898130noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-56447113964175816762017-07-27T16:57:30.733+01:002017-07-27T16:57:30.733+01:00This post is about comparisons between My Heritage...This post is about comparisons between My Heritage and FTDNA in general, rather than parent-child comparisons. My mother's ancestry was almost wholly from South Wales (just 1 English g-g-grandfather) and my father was Estonian. He did not know his father's identity, though he was definitely conceived in Estonia.<br /><br />The results are surprisingly similar:<br /><br /> FTDNA My Heritage<br />British 62% Irish/Scottish/Welsh 59.2%<br /><br />East Europe 17% Baltic 25.5%<br />Finnish 20% Finnish 13.3%<br /><br />Non-European <1% Native American 2.0%<br /><br />I can believe that it is quite difficult to distinguish Baltic/E. Europe/Finnish, and I expect that the non-European is Siberian or Sami rather than Native American! What surprised me was that my British component was substantially more than 50%. Is this just a lack of precision in the methodology, or it is evidence that my unknown grandfather was partly British?<br /><br />I would agree that My Heritage predicted relationships are optimistic, but no more so than those of FTDNA. Although I have 10 predicted 2nd-4th cousins and 119 3rd-5th cousins on FTDNA, none match with my paper trail and most seem very unlikely to be related within the last 250 years.Anonymoushttps://www.blogger.com/profile/01640182924760580357noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-79548363914508729112017-07-27T13:32:58.929+01:002017-07-27T13:32:58.929+01:00Jules, It sounds like you have your work cut out i...Jules, It sounds like you have your work cut out interpreting your matches when your parents are related to each other on so many distant lines. The more close relatives you test the better in your situation.<br /><br />I was also surprised at the gender imbalance. I can't think of an explanation.Debbie Kennetthttps://www.blogger.com/profile/11573470282571579765noreply@blogger.comtag:blogger.com,1999:blog-7238849140976286627.post-67105617641865988922017-07-27T00:34:49.172+01:002017-07-27T00:34:49.172+01:00Interesting.
On MyHeritage:
I have 8 matches. Fo...Interesting.<br /><br />On MyHeritage:<br /><br />I have 8 matches. Four of them I do not share with either parent. Of those four I do share two that are my parents (my parents are distant relatives on more than 8 different lines) so I share my dad as a match with my mom and my mom as a match with my dad. So I'm at 50%.<br /><br />My mom has only 3 matches (excluding myself). I share my dad with her and I share one other match. This shared other match seems to be genuine. Although from Austria, her surname is of my ethnicity and a preliminary search in newspaper archives hints that she is from my ancestral area.<br /><br />My dad has 57 matches (excluding myself). I share my mom and one other match with my dad. This other match I recognize as also being a match on 23andMe. The surname is English with no hints as to any relation to my ancestral area.<br /><br />What startles me is how many matches my dad has and how few me and my mom have. On 23andMe my parents are pretty balanced in terms of matches with both having 1200+. On FamilyTreeDNA my dad has about 300+ matches and my mother 200+ matches. Maybe in the grand scheme of things 5 or 60 matches don't seem to matter compared to a database that can give 1200 matches. My mom might be lagging behind now but it might even out, still seems a bit odd.<br /><br />I think it might be time to add my sisters to the MyHeritage database. They might match some of these matches of my parents that I do not match.Jules van Laarhttps://www.blogger.com/profile/10730263111027898130noreply@blogger.com