Exam 22: The Origin of Species

The most common mechanism for sympatric speciation in plants is

Many male songbirds have very distinctive songs that are used to attract females.These songs are an example of a ________ isolating mechanism.

Hybridization regularly occurs between three species of Darwin's finches on Daphne Major,but the finches are still considered different species because

Indicate the scenario(s)that could directly result in sympatric speciation.Check all that apply.

After an initial rapid rise in the number of species on Earth,there was a plateau that experienced very little fluctuation in the number of species.

Why do the Galápagos Islands and the Hawaiian Islands have so many endemic species of flies and birds? Check all that apply.

Adaptive radiation is best described as the

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

Select all of the following that are postzygotic isolating mechanisms.

The hundreds of species of Drosophila in Hawaii exhibit different mating rituals.This isolating mechanism is

Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.

Select the concepts emphasized by Ernst Mayr's biological species concept.Check all that apply.

Evolution acts at the level of the

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

The ________ definition of species says that a species is a group of organisms that are reproductively isolated from other such groups.

Which is an example of temporal isolation?

Which isolating mechanism is postzygotic?

Studies of snapping shrimp on either side of the Isthmus of Panama have shown that each Caribbean shrimp species is more closely related to a Pacific shrimp species than it is to any other Caribbean shrimp species.The most likely explanation for this result is

The sunflower species Helianthus anomalus is thought to have been formed by hybridization between the sunflower species H.petiolaris and H.annuus because it contains a set of chromosomes from both parental species.H.anomalus is most likely an example of instantaneous speciation through

If species are competing for the same resource,one species is likely to go extinct through competitive exclusion,or natural selection will drive the evolution of