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...

Small Segments: Are We Asking the Wrong Question?

Small segments affect most of our matches, whether we think we’re using them or not. I don’t know that I would call it a debate, but the discussion about low centiMorgan (cM) DNA segments continues with fervor. And I almost never hear any arguments from the...

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...

What is an accurate dataset in genetic genealogy?

The most important aspect of genetic genealogy that nobody talks about It first occurred to me to write this article about a year ago. I thought that I had much more important articles to write and tools to create, but I’ve recognized that the need for an...