Evolution

What is a species?

• A group of organisms that can mate with each other and produce fertile offspring. 
• A group of organisms that genetically are very different from each other. 
• A group of organisms that can mate and produce offspring even if those offspring are infertile.
• Indivual organisms that live in the same environment. 

What is speciation?

• The change from one species into two or more distinct species. 
• The movement of a group of organisms into a new area. 
• The ability to mate and reproduce.
• The death of an entire species. 

Individuals in a population that have a variation that gives them an advantage in their enviroment are more likely to ...

• survive and reproduce.
• die and not reproduce. 
• move to a different environment. 
• change their characteristics to fit the environment. 

Which of the three graphs might show a population of birds with members that specialize in different types of food?

• A
• B
• C

Which of the three graphs shows a decrease in variation?

• A
• B
• C

Which of the three graphs shows directional selection?

• A
• B
• C

Which of the three graphs shows stabilizing selection?

• A
• B
• C

Which of the three graphs shows disruptive selection?

• A
• B
• C

In the past, individuals in a population of seed eating birds had a wide variety of beak sizes. After many generations, the birds either have small beaks or large beaks, but medium size beaks are absent. If the number of birds with each beak size was graphed which example would it look like?

• A
• B
• C

If the number of  the darkest colored rock pocket mice that live on the lava flow has increased and the number of tan mice living in the same area has decreased, which pattern of natural selection has occurred?

• Directional selection
• Disruptive selection 
• Stabilizing selection