Exam 12: Adaptation and Species

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

Speciation

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

Which of the following is NOT an example of speciation?

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

Which of the following statements best explains the role of coevolution in speciation?

Match each numbered statement to one of terms listed below. -an organism's physical characteristics

Close ecological interactions between two different species may lead to

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 it attempts to mate with.This example shows adaptive evolution by

Which of the following does NOT provide an example of geographic isolation?

Every year,environmental signals in Africa cause flycatchers to return to the Netherlands to breed.When they arrive,they depend on freshly hatched caterpillars for food.Global climate change has caused the caterpillars to hatch earlier in the Netherlands,but the environmental cues in Africa remain the same.Now,when the flycatchers return to the Netherlands the caterpillars are no longer available as a food source.Which of the following is most likely to happen to this species of flycatcher?

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

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?

Before the cultivation of the apple tree,apple maggot flies laid their eggs exclusively on the fruit of Hawthorne trees.As apple orchards became more prominent,apple maggot flies began to lay their eggs on both the fruit of the Hawthorne tree and the fruit of cultivated apple trees.Now,apple maggot flies that live on apple trees mate and lay their eggs at different times of the year than apple maggot flies that live on Hawthorne trees.Is this an example of reproductive isolation?

The faster a cheetah can run,the more likely it is to capture its prey.Cheetahs with longer legs are able to run faster than those with shorter legs.Although the existing cheetah population shows a variety of leg lengths,cheetah legs are not continuing to increase in length from one generation to the next.Which of the following is a possible explanation?

For two populations to accumulate enough genetic differences to cause speciation,the factors that promote these differences

Genetic adaptations in two closely related species living within the same territory indicates that

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

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

How does geographic isolation lead to speciation?