Negative (and positive) selection in such a system never rests ... and a gradual decay of genomic integrity will be the result. This can lead to extinction for some species if it continues ...

Bats carry viral pathogens that typically do not lead to severe disease in the bats themselves but can be lethal to humans. Adaptations in certain immune genes might contribute to this resistance.

Genetic researcher Nathan Clark spoke about research his team at the University of Pittsburgh conducted on evolutionary ...

Darwin's engine, natural selection, had few supporters: Many people found it distasteful because it seemed to be ruthless and wasteful of life and had no positive, uplifting goal. Some of the ...