Comparing DNA tests

+4 votes
i took a DNA test with  I did the autosomal and have no brothers or uncles to do it.  However, I found a cousin who is direct male descendant of our shared Thomas Barnes in 1623. ( A male connection in each generation since Thomas). Ancestry doesn't do the Y DNA so I asked him to do the autosomal.  How will this help me?  I understand the autosomal doesn't go back very far.
in Genealogy Help by Alta Barnes G2G5 (5k points)

2 Answers

+2 votes

I agree - I would not expect much from autosomal DNA testing if the common ancestor for you and another tester is a man born in 1623.  I have always found this chart from FTDNA helpful in a case like this:

Chances of finding a match:
Relationship Match Probability
2nd cousins or closer > 99%
3rd cousin > 90%
4th cousin > 50%
5th cousin > 10%
6th cousin and more distant Remote (typically less than 2%)

by Ray Jones G2G6 Pilot (153k points)
+1 vote
As indicated by Ray Jones, atDNA is most effective in the first 5-10 generations.  You're Most Recent Common Ancestor (MRCA) is Thomas Barnes b.1623?  Not sure that he can help much with your atDNA search.

You might consider Y-DNA testing.  If everyone is who they appear to be on paper, then his Y-DNA would be pertinent.  But Y-DNA is only useful for direct male line ancestry.
by S Brooks G2G4 (4.3k points)

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