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In fact, as Chang suspected, the only way to explain the DNA is to conclude that everyone who lived a thousand years ago who has any descendants today is an ancestor of every European. If you compare two people in Turkey, you’ll find bigger shared segments of DNA, which isn’t surprising.Since they live in the same country, chances are they have more recent ancestors, and more of them.And then eight great-grandparents, sixteen great-great-grandparents, and so on. If you go back to the time of Charlemagne, forty generations or so, you should get to a generation of a trillion ancestors.That’s about two thousand times more people than existed on Earth when Charlemagne was alive.They took advantage of a compilation of information about 2257 people from across the continent.



If you look at the ancestry of a living population of people, he concluded, you’ll eventually find a common ancestor of all of them.You can use this kind of genetic information to make some genealogical inferences, but you have to know what you’re dealing with. Each time they made eggs or sperm, they shuffled the two copies of each of their chromosomes and put one in the cell.Just as a new deck gets more scrambled the more times you shuffle it, chromosomes get more shuffled from one generation to the next.They then used the length of each segment to estimate how long ago it arose from a common ancestor of the living Europeans.



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