Jens Clausen

Clausen, Keck, and Hiesey, of the Carnegie Institution at Stanford University, did a famous study of the genetic differentiation of the yarrow Achillea in the Sierra Nevada. This included the first use of "common garden" experiments to show that the geographic differentiation of form in this species was genetic.

Did you know: Hiesey's daughter is much more famous than he was? (She is the Princeton University religious historian Elaine Pagels, author of The Gnostic Gospels)

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