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Questions tagged [snp]

For questions about Single Nucleotide Polymorphisms (SNPs) as they pertain to genetic genealogy testing.

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 ...
5
votes
1answer
128 views

Why are MyHeritage atDNA SNPs higher than other test sites?

I have accumulated DNA segment match information from ftDNA, GEDmatch, and MyHeritage. It is just recently that I've added MyHeritage DNA donors data, and I've found that the total number of matching ...
6
votes
2answers
543 views

After a Big-Y test on FamilyTreeDNA does it make sense to order further SNP tests?

I ordered the Big-Y on top of my yDNA-111 STR test and it specifies many SNPs now that Big-Y is complete, but FTDNA continues to offer to sell me additional SNP tests and packets, in particular the I1 ...
7
votes
3answers
2k views

Converting AncestryDNA 1.0 file format to 2.0 and vice-versa?

I noticed today (1 Jun 2016) that AncestryDNA.com has converted over to their new 2.0 file format, where as about a week ago they were still on the 1.0 format. Both file formats state they are ...
5
votes
1answer
3k views

If you plan on getting a Big Y test, is there any value in going beyond yDNA-37?

For the FamilyTreeDNA.com yDNA tests, if you are pretty confident you are going to buy the Big Y test, would that fill in your SNPs up to yDNA-111 if you had only purchased yDNA-37 before upgrading to ...
3
votes
1answer
2k views

What is considered a strong match on a Big-Y DNA test?

I have done Big-Y on FamilyTreeDNA for a single individual and considering others as well as using the YFull interpretation service without fully understanding how to use it because I wanted to ...
6
votes
2answers
653 views

How likely is it that ftDNA made a mistake about my y-haplogroup?

I bought a National Geographic Geno 2.0 kit, tested by FamilyTreeDNA, and it says that I am of haplogroup that is very statistically unlikely for where my family is from. ftDNA did not check any SNPs ...