by DNA-Sci | Dec 31, 2020 | Blog, DNA Science
The amount of centiMorgans (cMs) we share with a relative tells us how closely related we are to them. Most people think about cM as a length. In fact, geneticists refer to it as “genetic length.” A smaller subset recognize that cM is the probability, in...
by DNA-Sci | Dec 28, 2020 | DNA Code
I’ve written two Python algorithms that I describe in this article. The algorithm below works for downloaded segment-level match files from GEDmatch. The other algorithm, found here, is for match files downloaded from MyHeritage. # Copyright (c) 2020 Brit...
by DNA-Sci | Dec 1, 2020 | Blog, DNA Science
Using very simple math to get the most out of multiple kits Many genetic genealogy enthusiasts have their own DNA genotyped as well as some of their siblings. As the enthusiast of your family, you might have access to all of these kits. Or, if they’re all on...
by DNA-Sci | Oct 23, 2020 | Blog, DNA Science, Probability and Statistics
A formula to improve the estimation of the genetic relationship between two parents GEDmatch has had a tool called “Are Your Parents Related” (AYPR) for a few years now. The tool is helpful and easy to use. Some have argued that this information shouldn’t be...
by DNA-Sci | Sep 29, 2020 | Blog, Probability and Statistics
What’s the probability that two children share one whole copy of the X chromosome without sharing a father? I’ve made an X chromosome model that predicts shared X DNA percentages and ranges for various ancestors, but I haven’t yet calculated ranges...
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