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9 votes

Does having child of DNA tested parent help find parent's DNA ancestors?

I think the prior answers are either misleading or wrong, and people should not miss out on the opportunity to get great DNA information because they were discouraged by those answers. If you have ...
6 votes
Accepted

Does having child of DNA tested parent help find parent's DNA ancestors?

Edit: Brainstorm and I had an extended discussion through the comments on whether Visual Phasing of siblings can add information that the parent's DNA test doesn't already add. I have been convinced ...
  • 16.5k
6 votes

Does having child of DNA tested parent help find parent's DNA ancestors?

I will try to explain more comprehensively. What does phasing do and what task does it solve? We use phasing to separate the list of matches of one's person into two smaller lists of probable ...
  • 1,075
4 votes

How can overlapping ~35 cM segments of matching kits not match each other?

The simplest and most likely cause of the lack of a match is that Alice is related to Bob and Charlie through different parents. If Alice inherited the 36 cM of DNA she shares with Bob from, say, her ...
  • 3,857
3 votes
Accepted

Phased psuedo-kit on GEDmatch -- what accounts for huge drops in SNP count?

GEDmatch does not disclose its methodology for phasing at GEDmatch Genesis. But if you and your mother tested at different companies, especially different companies that use different chips, then it ...
  • 16.5k
2 votes

Creating a phased DNA kit using grandparents' kits?

I have written an R library to do exactly what you are calling "grandparent-grandchild phasing". You can find the (open source) code at: https://github.com/castedo/genomology In addition to the R ...
  • 186
2 votes
Accepted

How can overlapping ~35 cM segments of matching kits not match each other?

This can happen even with full siblings of the same parents. Each parent has a chromosome 18 from each of their respective parents (the grandparents). Let's call the father's pair 18pp (paternal-...
  • 2,569

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