It’s generally believed that evolution is a gradual process that takes place over significant periods of time. When it comes to fruit flies, however, researchers have long known that their ...

Planktonic foraminifera -- tiny, shelled organisms that float in the sea -- left behind one of the most complete fossil records of evolutionary history in deep sea deposits. Consequently, ...

Charles Darwin's theory of gradual evolution is not supported by geological history, New York University Geologist Michael Rampino concludes in an essay in the journal Historical Biology. In fact, ...

Abrupt shifts in the evolution of animals – short periods of time when an organism rapidly changes size or form – have long been a challenge for theorists including Darwin. Now a newly published ...

Scientists have developed a theoretical model that uncovers the dual role of polyploidy -- organisms carrying extra genome copies -- in evolution. Their findings reveal that polyploidy can stabilize ...