Exit 2 Evolution

Front

Variation in a heritable trait between individuals in a population is caused by:

Back

Both an organism consciously adapting to the environment and randomly-occurring mutations.

Front

Pelican P is born with a larger bill than other pelicans of the same species. When pelican P breeds, some of its offspring also have larger bills. The appearance of pelican P’s large bill is most likely caused by:

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

The sickle cell mutation:

Back

is a change in the hemoglobin gene causing red blood cells to become crescent-shaped

Front

The mutation that results in the sickle cell trait:

Back

is helpful in some environments and harmful in others.