Evolution Mid-Unit Test

Front

What causes variation in a heritable trait between individuals in a population?

Back

randomly-occurring mutations.

Front

What is the most likely cause of pelican P's large bill?

Back

a mutation.

Front

According to the theory of natural selection, what is possible for a female giraffe with a short neck having difficulty reaching leaves in taller trees?

Back

The giraffe survives on leaves from shorter trees. Her offspring with longer necks are more likely to survive.

Front

Which of the following could describe a mutation in the population?

• Long-beaked birds have long-beaked offspring.
• Striped cats have striped offspring.
• Beige worms have beige offspring.
• Hornless cows have horned offspring.

Back

Hornless cows have horned offspring.

Front

More and more bacteria are becoming resistant to antibiotics. This is an example of which of the following?

Back

evolution by natural selection

Front

Imagine that increased pollution caused the pine trees in the forest to be heavily covered with brown particles. What is likely to happen?

Back

The brown moths would be less likely to be eaten by the birds. Over time, the moth population would have more brown moths.

Front

Why did the change in the moth color occur?

Back

The change in the moth color occurred because the environment caused it to happen.

Front

Why do green moths survive in the forest?

Back

Their coloring makes them better adapted than the brown moths.

Front

The sickle cell mutation affects the structure and/or function of a red blood cell.

Back

Affects both the structure and function of a red blood cell.

Front

The mutation that results in the sickle cell trait:

Back

is helpful in some environments and harmful in others