The pace of human evolution has accelerated  DEC 13 2007

The pace of human evolution has accelerated greatly over the last 40,000 years, partially due to our population growth.

The brisk rate of human selection occurred for two reasons, Dr. Moyzis' team says. One was that the population started to grow, first in Africa and then in the rest of the world after the first modern humans left Africa. The larger size of the population meant that there were more mutations for natural selection to work on. The second reason for the accelerated evolution was that the expanding human populations in Africa and Eurasia were encountering climates and diseases to which they had to adapt genetically. The extra mutations in their growing populations allowed them to do so.

Dr. Moyzis said it was widely assumed that once people developed culture, they protected themselves from the environment and from the forces of natural selection. But people also had to adapt to the environments that their culture created, and the new analysis shows that evolution continued even faster than before.

Looks like this study answers the "Is Evolution Over?" question.

Read more posts on kottke.org about:
evolution   genetics   humans   science

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