Question 1

4. Skeletal structures are common between two animals of different species. These structures probably exist because both species

Accepted Answer

are related to a common ancestor.

Answer

have a common food source.

Answer

live in the same environment.

Answer

have survived until the present time.

Question 2

5. Which statement describes the best evidence that two species share a recent common ancestor?

Accepted Answer

The species have similar DNA sequences.

Answer

The species are about the same size.

Answer

The species eat the same type of food.

Answer

The species live in the same ecosystem.

Question 3

6. The bones of a whale flipper are similar to the bones of a bat wing as shown in the illustration below. What does this similarity in bone structure suggest about the whale and the bat?

Accepted Answer

They evolved from a common ancestor.

Answer

They use the same methods to travel.

Answer

They can migrate to the same locations.

Answer

They can manipulate objects in the same way.

Question 4

7. To study the relatedness among plants, the scientist compared a specific RNA sequence in four different species of plants. The percent difference are shown in the table.

Which two species are most closely related?

Accepted Answer

2 and 4

Answer

1 and 3

Answer

1 and 4

Answer

2 and 3

Question 5

4. Which of the following factors has the greatest effect on whether leg stripes will become more common in the tree frog population

Accepted Answer

if the new allele for stripes increases the survival of the tree frogs in their environment

Answer

if the death rate of the tree frog population remains constant over time

Answer

if the new allele for stripes is dominant or recessive in the tree frog population

Answer

if enough food and water is available in the rain forest canopy for the tree frog population

Question 6

5. Which of the following is the original source of genetic variation within a species?

Accepted Answer

mutation

Answer

cloning

Answer

selective breeding

Answer

natural selection

Question 7

6. Whichof these best illustrates natural selection?

Accepted Answer

An organism with favorable genetic variations will tend to survive and breed successfully.

Answer

The largest organisms in a species receive the only breeding opportunities.

Answer

A community whose members work together utilizes all existing resources and migratory routes.

Answer

A population monopolizes all of the resources in its habitat, forcing other species to migrate.

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