Name: 
 

13-3 Review Questions



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Which of the following must happen for a new species to evolve?
a.
Isolation
b.
Adaptation
c.
Differentiation
d.
All of the above
 

 2. 

When a population becomes divided by an event such as a new river forming, ____ has occurred.
a.
differentiation
b.
isolation
c.
adaptation
d.
separation
 

 3. 

Variations in a population are caused by:
a.
natural selection.
b.
selective breeding.
c.
artificial selection.
d.
random mutations.
 

 4. 

Extinction occurs when ____ happens.
a.
loss of habitat
b.
isolation
c.
differentiation
d.
adaptation
 

 5. 

If an environment changes, populations with ____ have a better chance of survival.
a.
no genetic variations
b.
genetic variations
c.
a small number
d.
a large number
 

 6. 

The climate of a certain area is cold, and snow is found on the ground most of the year. Equal numbers of two populations of rabbits are introduced into this climate by a group of scientists. One of the populations is brown and the other is white. Predict what will happen over several generations.
a.
There will be equal numbers of brown and white rabbits.
b.
There will be more brown rabbits that white rabbits.
c.
There will be more white rabbits than brown rabbits.
d.
There is no way to predict what will happen to the rabbit population.
 

 7. 

The variations within a population will most likely be passed on to future generations if they are:
a.
due to a mutation and result in beneficial variations.
b.
due to a mutation and result in harmful variations.
c.
not due to a mutation and result in harmful variations.
d.
not due to a mutation and result in beneficial variations.
 

Short Answer
 

 1. 

How do mutations occur in an organism and how do they affect a population?
 

 2. 

How does isolation lead to the evolution of a new species?
 

 3. 

Why do populations with many variations have a better chance of survival than a population with little or no variations?
 

 4. 

What is meant by the term extinction? List three causes of extinction.
 



 
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