Variation in example sentence

And it's by looking at the pattern of genetic variation, the pattern of these markers in people all over the world, and assessing the relative ages when they occurred throughout our history, that we've been able to construct a family tree for everybody alive today.

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It doesn't give us observations of the variation at the annual or seasonal scale, that we know matters.

This kind of a sequence is said to have a very low entropy because there's no variation at all.

And if you do that, you find a certain amount of genetic variation in Africa.

And if you look outside Africa, you actually find less genetic variation.

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