X-DNA is usually more recent than autosomal DNA

New discoveries overturn the familiar adage that X-DNA is usually from a farther back ancestor than autosomal DNA As of today, you can test the new discoveries against the old adage by comparing any amount of X-DNA to the same amount of autosomal DNA. Two months ago I...
A Banner Year for DNA-SCI.com

A Banner Year for DNA-SCI.com

It will be hard to capture all of the discoveries that have been made and posted at this site in the past twelve months. A year ago I was using a very basic natural model of genetic inheritance. I had been publishing averages and ranges of shared DNA for relationships...
Mathematical Formulas for Genetic Genealogy

Mathematical Formulas for Genetic Genealogy

This post won’t be everyone’s cup of tea. But I’ve used these formulas countless times in programming in order to automate processes, which saves me a lot of time and work and prevents errors. Ethnicity The first time I ever wrote a formula for...

Shared X-DNA Between Relatives

X Chromosome averages and ranges are now available for the first time ever Remember to use the most accurate relationship predictor to find out how you might be related to your DNA matches. The 23andMe percentage input box is the only place where you can get...