Exam 13: Adaptation and Species

Individuals of the same species generally

For which of the following would a mountain range MOST likely represent a geographic barrier that would block gene flow?

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

Speciation

Two populations that live ________ do NOT provide an example of geographic isolation.

Some species of orchids attract wasps to assist them in reproduction by producing flowers that look like female wasps.The flowers fool male wasps into attempting to mate with them.As a result,the wasp is covered with pollen that it takes with it to the next flower with which it attempts to mate.This example shows adaptation by

Which of the following would NOT be expected after a population undergoes geographic isolation?

In many predator-prey relationships,evolutionary change in the prey will result in evolutionary change in the predator,a phenomenon known as

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

If two populations of beetles living in isolated areas are physically different but genetically similar,would they be considered one species or two? Explain your answer.

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

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.

The great diversity of life on Earth is caused by the formation of new species in a process known as ________.

Two populations of ________ are NOT an example of speciation.

Evolution by natural selection allows species to

How does geographic isolation lead to speciation?

Which of the following statements gives an example of coevolution?

Explain how a change in the depth,either a lengthening or shortening,of flowers that contain nectar eaten by a particular species of hummingbird would potentially lead to a change in the hummingbird.

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.

When a brightly colored guppy population is placed in an area containing many predators,the population changes in only a few generations to one containing only guppies with drab,dull colors that blend into their environment.This is an example of how natural selection can