Exam 13: Adaptation and Species

Some freshwater snail eggs are accidentally introduced into a new habitat that is geographically isolated from the original population.Which of the following must occur before these snails are described as two separate species?

According to the biological species concept,a species is defined when individuals of the same species

Which of the following statements is true about adaptation?

Using the biological species concept as a method of defining a species is NOT useful for

Which of the following is an example of a postzygotic barrier?

Two biologists discover two populations of toads living in the same area.Morphologically,these two populations are different.The toads in one population have much wider heads and darker coloration than the second population.One of the biologists suggests names for the two new species.The second biologist questions whether the two populations are separate species.Why is the second biologist hesitant to declare these populations are two species?

This figure shows two squirrels that represent two separate species.Explain how the geographic barrier between these two populations led to the formation of two distinct species.

Which of the following is MOST likely an example of coevolution?

Two species live in the same area but breed in different parts of their habitat.These species are

In general,geographical isolation occurs when

Which of the following must occur for one species to split into two or more species?

Geographic isolation limits the ________ between separated populations of a species.

Close ecological interactions between two different species may lead to

Which of the following is an example of a prezygotic barrier that can isolate two species living in the same geographic area?

Individual organisms with inherited characteristics that enable them to survive and reproduce are said to have greater ________ fitness than individuals who fail to survive and reproduce.

Populations within a species are connected by

Choose two different reproductive barriers that lead to sympatric speciation and explain how they work.

The formation of a new species

A lizard is attacked by a bird.The lizard escapes and survives without his hind legs.Fortunately for this lizard,the loss of his hind limbs allows him to live within a smaller crevice than other lizards of the same species,so he experiences less competition.Which of the following is true for this lizard?

Based on the ________ species concept,organisms that interbreed and produce fertile offspring are most likely classified as species.