Marked geographic patterns for the distribution of some heritable traits are observed in humans, including traits related to disease risk, pathogen resistance and drug response. In some cases, the ...

The unexpected discovery of a new type of genetic variation suggests that natural selection -- the force that drives evolution -- is both more powerful and more complex than scientists have thought.

The darwinian evolutionary process can be summarized into three components: struggle for existence, variation in characters that influence success in that struggle, and transmission of that variation ...