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Questions tagged [gedmatch.com]

Public Database and Comparison Tools for Autosomal DNA Results (23andMe/AncestryDNA/FamilyFinder) that accepts results from multiple testing services. GEDMatch.com is a Non-Commercial / Volunteer run website.

2
votes
1answer
23 views

Interpreting matches with low cM values and high SNPs (or vice versa)?

On GEDmatch's autosomal one-to-one report, a match contains a column for cM and a column for SNPs values, for each of the matching chromosomes. Normally you look for high cM values as an indicator of ...
1
vote
2answers
68 views

Explaining how all DNA matches are shared with Half sibling?

I have DNA matches from Ancestry, FTDNA, GEDMatch, and My Heritage. My half-sister also tested with Ancestry. It confirms we are half siblings and share the same mother. I do not know who my father ...
2
votes
2answers
88 views

Finding Korean War-Baby Brother using GEDmatch?

My dad got a lady pregnant in Korea while he was in the war. When he got back, he tried to move her here but was unable to. He lost touch with her. For years, I have tried to find him but there was no ...
2
votes
0answers
28 views

Interpreting runs of homozygosity data to determine how closely parents were related?

According to Gedmatch's Are your parents related? tool, my grandmother's DNA shows several runs of homozygosity (ROH): Chr Start Location End Location Centimorgans (cM) SNPs 3 180690286 ...
1
vote
1answer
29 views

Identifying maternal grandfather through autosomal DNA testing?

How can I identify who my maternal grandfather was through autosomal DNA testing? My mother was born in 1928 and is deceased. She had no full siblings. I have taken a DNA test on Ancestry.com, ...
3
votes
1answer
45 views

Are there different amounts of “fuzziness” in the endpoints when doing pairwise 1-1 comparisons among three people at GEDmatch?

I was performing a triangulation at GEDmatch and obtained the following start and end points for the triangulated segment on Chromosome 1 for each comparison: Person A with Person B: 19,899,991 ...
5
votes
1answer
53 views

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

I guess first I should make sure I understand how GEDmatch stores raw data -- I'd guess that during "tokenization", GEDmatch turns my raw data file into a format that it likes, i.e., perhaps replacing ...
3
votes
1answer
108 views

Why would I match someone in a region neither of my parents do?

I was surprised to find someone show up in FTDNA as a 2nd-3rd cousin to me (168 shared cM, 34 segments with a minimum length of 5 cM) but not among the 17,667 matches of my father or the 18,178 ...
7
votes
1answer
123 views

Explaining major discrepancy in genomic position between Gedmatch and MyHeritage?

I have identified a discrepancy with several test kits that were tested at Ancestry, with results transferred to both Gedmatch and MyHeritage, all relating to the same area at the end of chromosome 19....
4
votes
2answers
277 views

maternal haplogroup and X-DNA Comparison: is this likely a relation?

A member of my maternal haplogroup (K1a4) has a nominal 10.5cM at estimated 5 generations match via GEDmatch which suggest the possibility of a distant cousin (A*/Ancestry test compared with T* test). ...
2
votes
1answer
172 views

Is a DNA match with a very high X-DNA cM value always valid (or could it be a false-positive)?

Recently I've been taking special notice of X-DNA matches, and I've come across several DNA matches where the X-DNA cM value is very high (but the atDNA cM value is very low). I have first cousins ...
0
votes
1answer
99 views

Helping my son find his unknown biological father

My son's biological father and his family is unknown. Both my son and I took Ancestry DNA tests. Then I went through his matches for "shared matches" - if I didn't show up, I assumed the match was ...
2
votes
0answers
247 views

Is the relationship an aunt /niece or half sister to my mother?

I am a genetics beginner: A little back story: My mother was adopted at birth. She found her birth mother and siblings back in the 90s. The birth mother was deceased at the time, and we also ...
-2
votes
1answer
80 views

“non-zero cM for X” result needed for GEDmatch Relationship Calculator?

This utility calculates probable relationship paths based on Autosomal and X-DNA Genetic Distances. This application only works properly for 2 kits with a non-zero cM result for X. Please explain ...
8
votes
1answer
788 views

How does the GEDMatch Relationship Tree Projection Tool Work?

This is an advanced question. I know how to use the tool. A good answer will explain how it does what it does. An ideal answer would come from the person who wrote the tool for GEDmatch. The purpose ...
4
votes
0answers
95 views

When the same name or family comes up in ancestors of DNA matches

I am pouring through the family trees of my DNA matches on both GEDMatch.com and Ancestry.com and, while it hasn't helped me solve any road blocks yet in the 2 years since I tested myself, I have ...
6
votes
1answer
422 views

What does 'DD' mean in a name on GEDmatch.com?

On GEDmatch.com I've seen numerous matches that include a DD prefix on a name like: DD Mary Brown What is this convention and what does DD stand for?
3
votes
4answers
179 views

How to upload a “stripped” GEDCOM to DNA sites

I want to find a simple little app/software that would strip my GEDCOM of any non-blood relatives (plus spouses) and eliminate any non-vital data (only include birthdates, birthplaces, deathdates, ...
3
votes
2answers
113 views

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

How can overlapping 36.8937 cM (from 11,551,254 to 48,458,402) and 82.9541 cM (from 12,460,601 to 74,135,725) matches on Chromosome 18 not match each other? On GEDmatch, I compare Alice to Bob and ...
5
votes
3answers
2k views

Finding out which DNA matches are from paternal side?

I've submitted my DNA to Ancestry and GEDmatch in a desperate attempt to match to anyone from my paternal side. I am unsure of who my father is and my mother will take that information to her grave. ...
5
votes
0answers
298 views

Finding Native American Tribal Affiliation through DNA?

My husband is about 40-60% Native American, depending on which engine we run it through (Family Tree DNA or Gedmatch's various engines). His mother is from Ecuador, and his father is Mexican from the ...
7
votes
1answer
257 views

Why is GEDmatch report omitting some matches?

I ran a GEDmatch multi-kit analysis and got this report for Matches with Joseph's kit, for chromosome 12: And putting a different kit in first position, I get this report for matches with Charlotte: ...
1
vote
2answers
362 views

Why is the total shared Centimorgans 52.7%?

Can you please tell me what I have done wrong in my calculation? I added all the Centimorgans from my Gedmatch chart and it gave a total of 3587 which is 52.7% It should have been 50% only. The ...
5
votes
2answers
3k views

What explains sharing a 28.6 cM DNA segment with a sixth cousin?

According to GEDmatch.com I have a sixth cousin that matches my autosomal DNA on chromosome 6 in a segment that is 28.6197 cM from 16,806,001 to 42,035,791. This only overlaps with my first cousin ...
1
vote
0answers
575 views

Understanding Native American DNA at gedmatch.com?

How come gedmatch.com shows my alleged Native American DNA, but ancestry.com, FTDNA.com and 23andme.com does not? Does anyone know why that is? What is the difference between gedmatch database and ...
1
vote
1answer
44 views

When will early 2016 23andMe kits be uploadable to GEDmatch.com?

I have a cousin that took a 23andme autosomal DNA test and they reported: I am having trouble uploading my raw data . My 23&me data was purchased more recently so it will not let me download. ...
5
votes
1answer
682 views

Why are the lengths GEDmatch.com Chromosome Segment Matching segments not proportional to their cM?

The GEDmatch.com Chromosome Segment Matching report has the following legend: One of my reports has the following triangulation match: The purple segment (< 5 cm) is 102912701 - 111046063 (4.189 ...
8
votes
1answer
3k views

Which Gedmatch admixture calculators are most useful for an individual of predominately African American descent?

According to my Ancestry DNA autosomal test results, my admixture is 70% Sub-Saharan African, 25% European and 4% Native American. Which Gedmatch admixture calculators might I find particularly useful ...
5
votes
1answer
2k views

Half sisters or aunt/niece relationship?

I do not know who my father is and a woman (who also doesn't know who her father is) recently came up matching me on Ancestry.com as a close relative. She and I both uploaded our raw data to gedmatch....
6
votes
2answers
3k views

How do I convert my RAW FamilyTreeDNA FamilyFinder test result files to Ancestry or 23andMe format?

How do I convert the the RAW FamilyTreeDNA.com Family Finder Autosomal and X DNA result files into another sites format like Ancestry.com's or 23andMe's format? There is a growing need to do this as ...