Darwin (unit)
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The darwin (d) is a unit of evolutionary change, defined by J. B. S. Haldane in 1949. It is named after English naturalist Charles Darwin. One darwin is defined to be an e-fold (about 2.718) change in a trait over one million years.
The equation for calculating evolutionary change is r = (lnX2 − lnX1) / Δt, where X1 and X2 are the inital and final values of the trait, Δt is the change in time in millions of years and r is in darwins.
[edit] References
- J. B. S. Haldane (1949). "Suggestions as to quantitative measurement of rates of evolution." Evolution 3:51–56.
[edit] External links
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