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

by DNA-Sci | 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. Remember to use the most accurate relationship predictor to find out how you might be related to your DNA matches. Suppose that you and some friends want...

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

by DNA-Sci | 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 DNA-Sci | Mar 2, 2021 | Blog, DNA Science

Remember to use the most accurate relationship predictor to find out how you might be related to your DNA matches. 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...

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