Interpreting DNA results #dna


Sandra Krisch
 

Dear colleagues,

In searching for living relatives of a Holocaust survivor, Lipman
RADZIK, I discovered in JewishGen's archives that a researcher named
Richard RADZIK was seeking information about his great-grandfather
Leon RADZIK's family. All that was known was that Leon had probably
changed his name >from ROZENSZTEJN to RADZIK after reaching America.

Analysis of anecdotal information and available vital records
suggested that Leon RADZIK had most likely begun his life as Berysz
ROZENSZTEJN, the son of Abram and Sura Ester ROZENSZTEJN of Zuromin,
Poland.

To test this hypothesis, DNA samples were collected >from two men.
One was Robert ROSENSTEIN, a great-great-grandson of Litman
ROZENSZTEJN. The other person tested was Richard RADZIK. If our
theory was correct, he too would be a great-great-grandson of Litman
ROZENSZTEJN

The test results are in. They show that Robert was one of 18 people
who exactly matched Richard on the 12-marker test. Robert was the
only person to exactly match Richard on the 25 marker test. Robert
was one of four people to match Richard on 34 out of 37 markers, but
the only one matching all 25 markers on the 25 marker test.

What conclusions do these data allow us to draw regarding whether --
and more importantly when(i.e. how many generations ago)--Robert and
Richard had a common ancestor?

How does the finding on matches on 34 of 37 markers relate to a
finding of 25 of 25 matches? Does it strengthen or weaken the
likelihood that Robert and Richard are both descended >from a common
great-great-grandfather?

We are calling ourselves cousins. What do we know about the
closeness of our relationship? How confident can we be that we are
correct?

Sandra Krisch
Carefree, AZ

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