Exam 22: The Origin of Species

Two groups of organisms that differ from one another in one or more characteristics and do not hybridize extensively if they occur together in nature are considered to be different

Select the best answer from the choices listed that describes punctuated equilibrium proposed by Eldredge and Gould in 1972.It is an evolutionary process that involves

The model proposed by Eldredge and Gould for the formation of species is called the ___________ model.

Which one of the following statements about the adaptive radiation of New Zealand alpine buttercups is false?

The __________ __________ model assumes that evolution occurs in spurts,between which there are long periods of stasis with little evolutionary change.

Prezygotic mechanisms lead to reproductive isolation by preventing the formation of

If a new species is produced by the interbreeding of two members of distinct species,this would be __________ speciation achieved via __________.

Lake Victoria is famous for its variety of cichlid fishes.In fact,they offer the most diverse assembly of vertebrates presently known to science.One trait that scientists have focused on,as one possible reason for their adaptability is

The process by which related species become more different in order to reduce competition is called ___________ __________.

In the southeastern U.S. ,two species of wild lettuce (Lactuca)do not usually form hybrids,because they bloom at different seasons.The means of isolation appears to be

Imagine two species of birds with similar beak sizes and diets.Where the two species are allopatric,we would expect that their beak sizes

Which of the following is true about speciation on island archipelagos?

The most common mechanism for sympatric speciation in plants is

The model that assumes that evolution proceeds with slow successive change in a given evolutionary line is referred to as

A virgin pine forest covers a valley,and one of the inhabitants is a red squirrel species.A large volcanic eruption occurs and separates the valley with a huge lava flow that the squirrels cannot cross,thus producing two isolated populations of squirrels.What change needs to occur for the two populations of squirrels to become separate species?

Which form of speciation is most rapid?

Which one of the following statements about gradualism and punctuated equilibrium is false?

Adaptive radiation is likely to produce several to many

Which of the following is not a reason that the Galapagos Islands and the Hawaiian Islands have so many endemic species of flies and birds?

Which one of the following statements about the Lake Victoria cichlid fishes is false?