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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...

How far back is the ancestor who gave me a particular ethnicity?

by Brit Nicholson | Mar 2, 2021 | Blog, DNA Science

People often ask a question similar to this one: If my ethnicity report is showing 5% Iberian, how far back should I expect to find an ancestor of mine who was Iberian? There’s a mathematical way to estimate the answer to that question. I’ll discuss that...

Recent Posts

  • Double Cousin Relationship Predictions from Ped-sim
  • A New Option to Include X-DNA in Relationship Predictions
  • Relationships Predictions from Ped-sim

Recent Comments

  • 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
  • Brit Nicholson on Relationships Predictions from Ped-sim

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