Timeline for Why is GEDmatch report omitting some matches?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Apr 15, 2017 at 2:38 | vote | accept | WilliamKF | ||
| Apr 15, 2017 at 2:38 | comment | added | WilliamKF |
@lkessler Thanks, didn't realize the technology was doing an OR and thus allowing a match to hop back and forth between your mom and dad. Hopefully they will improve the sequencing in the future to map the two sides of a chromosome independently, which would make a match transitive.
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| Apr 14, 2017 at 4:53 | comment | added | lkessler | @WilliamKF - Roberta Estes gives a similar example here: dna-explained.com/category/ibc-identical-by-chance and talks about an identical by chance match due to "zigzagging back and forth between your Mom's and Dad's DNA strands." | |
| Apr 14, 2017 at 4:44 | comment | added | lkessler | @WilliamKF - Kitty Cooper describes it quite well here: blog.kittycooper.com/2014/10/… She gives an example of Dad giving her AAAAAAAAAAA and Mom giving her CCCCCCCCCCC and how she would appear to match to anyone with either A's or C's on that segment, e.g. ACACCAACCAC or CCAACCCACA. So using that example, people with AAAAAAAAAAA on that segment will match to each other on her dad's side, and people with CCCCCCCCCCC on that segment will match to each other on her mom's side. | |
| Apr 13, 2017 at 18:47 | comment | added | WilliamKF | This answer contradicts my current understanding of DNA, can you provide a source to cite your argument that in any given segment range, there are two sides to the segment and a match could be on one side or the other, and thus segment matching is not transitive? (Note: I do agree that for any given segment, it may consist of portions from your dad and other portions from your mom.) | |
| Apr 12, 2017 at 18:22 | comment | added | Harry V.♦ | @ColeValleyGirl I would have to look at the data again but it was a combination of the overlap of several of the matches and length of segments that made me think this. Coincidences happen, though, and I could be wrong. | |
| Apr 12, 2017 at 17:35 | comment | added | user104 | @HarryVervet interested to know how you could tell that from the 2D chromosome browser. | |
| Apr 12, 2017 at 14:54 | comment | added | Harry V.♦ | It was my first thought too that they matched on opposite chromosomes, but looking at the data (which has since been edited out of the question) I came to conclusion this was unlikely | |
| Apr 12, 2017 at 14:40 | history | answered | lkessler | CC BY-SA 3.0 |