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Helping people when additional siblings have tested

Helping people when additional siblings have tested

by Brit Nicholson | Feb 3, 2022 | Blog, DNA Science

Coincidentally, while testing the best methods for using multiple siblings’ kits, a person I’m helping has a close match to a sibling pair. This is a practical application of helping people with advanced genetic genealogy methods. I was recently finishing...
Charles II, Habsburg of Spain: What exactly was up with his DNA?

Charles II, Habsburg of Spain: What exactly was up with his DNA?

by Brit Nicholson | Apr 18, 2021 | Blog, DNA Science

Previous calculations could only estimate the expected value I see a lot of articles and posts being shared about Charles II of Spain. He was the last of the Habsburg dynasty and that demise has been attributed to the extreme intermarriage in his recent family tree...

My best guess is that I got 25% of my DNA from each grandparent, right? Wrong

by Brit Nicholson | Mar 12, 2021 | Blog, DNA Science

You already know that you get 25% DNA, on average, from a particular grandparent. But we can do better than that. See the relationship predictor that uses the most accurate ranges of shared DNA available. Suppose that you and some friends want to place a bet. You each...

Why does 23andMe show that I share an unusually high amount of DNA (50%) with my full-sibling?

by Brit Nicholson | Mar 3, 2021 | Blog, DNA Science

Alternate title/misleading answer: 23andMe counts FIR twice Scientists who aren’t familiar with genetic genealogy will be very confused by the above question. After all, 50% is the expected amount, or average, that two siblings share. AncestryDNA doesn’t report the...

23andMe: Statistics for Use by Counselors in Cases of Incest

by Brit Nicholson | Feb 14, 2021 | Blog, DNA Science

You probably got here from this page. If not, it’s probably a good idea to go look at it and see what this page is about before continuing. Some of the statistics here won’t actually be viewable at 23andMe. The real purpose of this page is to provide the...
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Recent Posts

  • X-DNA is usually more recent than autosomal DNA
  • Double Cousin Relationship Predictions from Ped-sim
  • A New Option to Include X-DNA in Relationship Predictions

Recent Comments

  • Shanda Kerschner on New Feature: Relationship Predictions at GEDmatch
  • Brit Nicholson on Double Cousin Relationship Predictions from Ped-sim
  • Brit Nicholson on Code for an Algorithm to Find Your DNA Segments Based on MyHeritage DNA Matches
  • Julie Kelts on Code for an Algorithm to Find Your DNA Segments Based on MyHeritage DNA Matches
  • Jamie Cox on Double Cousin Relationship Predictions from Ped-sim

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