Sunset at Gowanus Bay

Sunset at Gowanus Bay
Sunset at Gowanus Bay, Henry Gritten, 1851

Friday, February 27, 2015

An Application of FTDNA's Big-Y Test to our Brewer DNA Project

Back in late 2013, Family Tree DNA (FTDNA) began offering a new Y-Chromosome DNA test called Big-Y. Over the past months Richard Brewer, Administrator of the Brewer DNA Project, has led a comparison test involving three descendants of Jan Brouwer of Flatlands, L. I., utilizing the Big-Y test. Our initial question, the reason why this three-way comparison was first considered, was could we determine, from Big-Y test results, whether or not one of the three participants, a descendant of John Rose who closely matched descendants of Jan Brouwer on earlier Y-DNA tests based on STR matches, was in fact a descendant of Jan Brouwer (post 1600), or was he a descendant of some ancestor previous to Jan Brouwer (pre-1600). We also wished to discover whether or not Big-Y testing would enable us to determine when the Most Recent Common Ancestor (MRCA) for the descendant of John Rose, and the two descendants of Jan Brouwer, lived.

The Big-Y test, executed by FTDNA, produced results that were then forwarded to YFull for additional analysis. Richard Brewer then took this analysis and further applied it to our specific questions. His conclusions are now available online in the form of two papers which can be accessed by the links that follow.

An Application of FTDNA's Big-Y Test to our Brewer DNA Project - Executive Summary (short form, 4 pages)

An Application of FTDNA's Big-Y Test to our Brewer DNA Project - Complete Report (34 pages)

For some background on the Big-Y test, see FTDNA's Learning Center page, published in January 2014. Also see Debbie Kennett's post of 9 November 2013 at Cruwys News.

The above two reports are also found on this website's page, "By Richard Brewer."

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