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MATH AND SCIENCE APPLIED TO GENETIC GENEALOGY

If you’re interested in X Chromosome DNA, be sure to check in with this article from time-to-time as I update it with data for additional relationships. This is the only place to find shared X-DNA ranges. Data for 2nd cousins once removed and some half-relationships are now available.

Tools

RELATIONSHIP PREDICTOR 

This relationship predictor uses the most accurate data currently available and shows differences between maternal and paternal relationships.

multiple cousin PREDICTOR 

This tool is the same as the above relationship predictor except that it includes 3/4 siblings and double 1st cousins—the first tool of its kind.

AYPR/ROH Predictor

After using the GEDmatch “Are Your Parents Related?” tool, the best thing to do next is to enter the cM amount directly into this tool.

DNA COVERAGE

How much of an ancestor’s DNA do you have? How much would you be able to reproduce if you and various relatives all had your DNA tested?

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