Question 1

Based on the information shown in the figure, what do you predict the fourth generation will look like?

Accepted Answer

A)  All the hamsters will have mottled tan/black fur. 
B)  There is no way to predict what the fourth generation will look like. 
C)  All the hamsters will be tan. 
D)  Five hamsters will be black. 
E)  All the hamsters will be black.

Question 2

Inbreeding is defined as

Accepted Answer

A)  sexual reproduction among closely related individuals. 
B)  sexual reproduction in a large population. 
C)  reproduction among unrelated individuals. 
D)  sexual population among unrelated individuals. 
E)  reproduction within a geographically isolated population.

Question 3

Which of the following can cause evolutionary change in a small population?

Accepted Answer

A)  Lack of gene flow 
B)  All recessive alleles 
C)  Lack of mutations 
D)  Genetic drift 
E)  Homozygous individuals

Question 4

Bright coloration in birds makes them stand out to predators. In female birds that sit on the nest, bright coloration is rare. This is likely the result of

Accepted Answer

A)  artificial mutations. 
B)  gene flow. 
C)  natural selection. 
D)  coevolution. 
E)  stabilizing selection.

Question 5

The 30,000 elephant seals alive today are genetically very similar due to

Accepted Answer

A)  artificial selection. 
B)  random mutation. 
C)  the bottleneck effect. 
D)  natural selection. 
E)  the founder effect.

Question 6

-Explain how disruptive selection could lead to the development of two species from one original founding population.

Accepted Answer

The answer of 
-Explain how disruptive selection could lead to...

Question 7

Mutations

Accepted Answer

A)  limit the potential for evolution. 
B)  arise due to environmental pressures. 
C)  can be helpful, neutral, or harmful to individuals. 
D)  are caused by natural selection.

Question 8

If the tallest and shortest individuals of a population of humans do not survive and reproduce as well as the individuals of ʺaverageʺ height, which type of selection would most likely result?

Accepted Answer

A)  Directional selection 
B)  Artificial selection 
C)  Disruptive selection 
D)  Stabilizing selection

Question 9

Suppose a small population of deer is introduced to an island. All of the original males have 6 to 10 points on their antlers, and the average male has 8 points. After several generations, if most males have antlers with 10 points and no males have 6 points, the population has undergone__________ selection.

Accepted Answer

The answer of Suppose a small population of deer is...

Question 10

Genetic drift results in a change in allele frequencies because

Accepted Answer

A)  the population has not yet stabilized. 
B)  gene flow within the population allows alleles to flow between populations. 
C)  the population size is so small that chance occurrences can alter allele frequencies. 
D)  the population is so large that natural selection has little noticeable effect.

Question 11

The bright coloration of male birds is often the result of

Accepted Answer

A)  gene flow. 
B)  genetic drift. 
C)  sexual selection. 
D)  stabilizing selection. 
E)  coevolution.

Question 12

A young male baboon leaves the troop that he was born in and joins a small neighboring troop of small baboons. He quickly rises to become a dominant male. From an evolutionary point of view, what important process has occurred?

Accepted Answer

A)  Gene flow 
B)  Nonrandom mating 
C)  Natural selection 
D)  Genetic drift 
E)  The bottleneck effect

Question 13

Members of one gender influence allele frequencies in a population by choosing mates according to some conspicuous feature in the other gender in the process called

Accepted Answer

A)  genetic drift. 
B)  random evolution. 
C)  random mutation. 
D)  fitness. 
E)  sexual selection.

Question 14

A bacterial allele that provides resistance to the antibiotic streptomycin is

Accepted Answer

A)  always beneficial to the bacterial cell. 
B)  beneficial to the cell in the presence of streptomycin. 
C)  beneficial to the cell in the presence of any antibiotic. 
D)  always detrimental to the cell. 
E)  neither beneficial nor detrimental to the cell.

Question 15

Having greater evolutionary fitness means

Accepted Answer

A)  being better able to survive. 
B)  being larger or faster. 
C)  being able to produce more sperm or eggs. 
D)  having more offspring. 
E)  being stronger.

Question 16

Gene flow results when new individuals migrate into an area and join the breeding population there.

Accepted Answer

A) True 
 B)False

Question 17

A city was intensively sprayed with the chemical DDT to control houseflies. The number of houseflies was immediately greatly reduced. Each year thereafter, the city was sprayed again, but the flies gradually increased in numbers until 10 years later when they were as abundant as they were before the control program began. Provide an evolutionary explanation of what happened.

Accepted Answer

The answer of A city was intensively sprayed with the...

Question 18

If two or more phenotypes in a population are both favored by selection, what is happening?

Accepted Answer

A)  Stabilizing selection 
B)  Sexual selection 
C)  Balanced polymorphism 
D)  Gene flow 
E)  Directional selection

Question 19

Multidrug-resistant bacteria

Accepted Answer

A)  have always been common in the natural environment. 
B)  have been eradicated worldwide. 
C)  are becoming less widespread. 
D)  are not serious threats to human health. 
E)  are becoming more widespread.

Question 20

In a single family, the parents have brown eyes but all five of their children have green eyes. This is an example of evolution.

Accepted Answer