What controversial theory in evolutionary biology proposes that most sexually reproducing species will experience little or no evolutionary change and remain in an extended state called stasis?
Punctuated equilibrium Punctuated equilibrium Punctuated equilibrium (also called punctuated equilibria) is a theory in evolutionary biology which proposes that once species appear in the fossil record the population will become stable, showing little evolutionary change for most of its geological history. This state of little or no morphological change is called "stasis". When significant evolutionary change occurs, the theory proposes that it is generally restricted to rare and geologically rapid events of branching speciation called cladogenesis. Cladogenesis is the process by which a species splits into two distinct species, rather than one species gradually transforming into another. Punctuated equilibrium is commonly contrasted
Extended evolutionary synthesis the extended synthesis want them to be considered first-class evolutionary causes. The biologist Eugene Koonin wrote in 2009 that "the new developments in evolutionary biology by no account should be viewed as refutation of Darwin. On the contrary, they are widening the trails that Darwin blazed 150 years ago and reveal the extraordinary fertility of his thinking." The extended synthesis is characterized by its additional set of predictions that differ from the standard modern synthesis theory: The extended evolutionary synthesis is currently being tested by a group of scientists from eight institutions in Britain, Sweden and the United States. The