Is DNA connections as a result of yDNA testing an automatic or manual process?

+2 votes
63 views
Morning All,

I need assistance in understanding how DNA connections work.

I've completed DNA testing, and understand that my yDNA haplogroup will be the same as my male progenitor through the past hundreds of years. So Francois du Toit, Du_Toit-82, was my male family progenitor in South Africa after leaving France.

Am I right in understanding that of I can trace my line back to him through records, which I think I have, my yDNA is most likely the same as Francois?

Please help!

Thanks

Juan
WikiTree profile: Fran├žois du Toit
in WikiTree Help by Juan du Toit G2G Crew (770 points)

1 Answer

+3 votes
It depends on what you mean by "most likely" and what you mean by "can trace." Wikitree has specific standards for labeling a father/son connection as "confirmed with DNA". Essentially, Wikitree has drawn a line and said "you can only put confirmed with DNA if you have passed a threshold of likelihood that they were father/son by meeting these standards."

You only have a paper trail connecting you to Francois through your paternal line, but WikiTree policy would not have you mark any of those connections as confirmed with DNA, because there is no proof that your Y-DNA actually came down to you through each of those connections, regardless of what the paper says. Sometimes, a family makes up a lie, and they stick to it so well that all of the paper records state the lie rather than the truth. You just can't know.

If you want to increase the likelihood that you and Francois have the same Y-chromosome, excepting probably a few mutations, you need to find another person who can reliably trace their paternal line back to Francois through paper records and compare your Y-DNA to theirs. If yours matches this agnate cousin, excepting a smattering of mutations, then people would say you are then much "more likely" to have the same haplogroup as Francois.

Just using the paper trail, the likelihood that your Y-chromosome matches Francois's all depends on how solid the paper trail is. With so many generations between you and Francois, going back to the 17th century, there is usually a connection or two that is less certain than the others. And again, sometimes the paper just lies. One of the good uses of a Y-DNA test is adding additional evidence to shore up those connections, but to do that you need to find a cousin to test and see if he matches you.
by Barry Smith G2G6 Pilot (219k points)
Hello Barry,

Thanks for the detailed feedback. Appreciated.

I can appreciate that we really do not know the entire truth as a certainty.

I will be on the lookout for a cousin to see what I can confirm via testing.

Regards

Juan

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