Exam 13: Adaptation and Species

The fossils of two adult birds are found in a nest containing several fossilized eggs.Physically,the bird fossils look very different.Scientists are most likely to classify these species using

Which of the following examples does NOT illustrate a difference in fitness that would lead to evolution by natural selection?

Populations within a species are connected by

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?

Within a population of mice there is an allele for a gene that leads to the production of larger front teeth.In areas where seeds have thicker coatings,larger teeth allow these mice to chew through thicker seed coatings and survive at a higher rate than mice with smaller teeth.Would you expect an increase in the percentage of mice with larger teeth in a population of mice living in an area with seeds that have thicker coatings? Explain your reasoning.

A microbiologist discovers a Streptococcus bacterium living on a human scalp.She wants to know whether the bacterium she found is the same species as a Streptococcus bacterium she isolated from the throat of the same human.Explain how she could determine whether these bacteria are the same species.

Two populations of lizards live in the same area.Which of the following evidence would convince you that they are two distinct species?

The rough-skinned newt produces one of the most potent toxins on the planet.Scientists in Oregon have found that as newts evolve to produce a more deadly toxin,their primary predator,the garter snake,evolves ways to resist the toxin.This is an example of

Close ecological interactions between two different species may lead to

Evolution by natural selection allows species to

When populations of a species are separated by a physical barrier,thereby becoming geographically isolated and subsequently reproductively isolated from one another,________ speciation can occur.

Identify whether a type of reproductive barrier is prezygotic or postzygotic. -gametic isolation

Which of the following is one of the three important characteristics of an adaptation?

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.

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

Match each numbered statement to one of the terms listed below. -process by which one species splits to form two species or more

Identify whether a type of reproductive barrier is prezygotic or postzygotic. -hybrid sterility

Which of the following statements is true about adaptation?

How does coevolution lead to speciation?

A large population of animals is split in two by a physical barrier.Over time,the genetic makeup of the two resulting populations becomes more and more different until each population becomes a separate species.This is an example of