Download BioFlix Study Sheet for Mechanisms of Evolution

AP Biology
Name: ____________________
BioFlix Study Sheet for Mechanisms of Evolution
1. What are allele frequencies?
2. In the table below, describe the mechanisms of evolution. Give at least two examples of each.
Your example can be from the animation, from your textbook, or you can come up with your own
example.
Mechanism of Evolution
Description
Two Examples
Natural Selection
Genetic Drift
Gene Flow
3. Which mechanism of evolution causes populations to become better adapted to their environments?
AP Biology
BioFlix Quiz – Mechanisms of Evolution
Write the answer to each question in the blank. Note that the order of the answer options does not match
the online version of the quiz.
____1. The evolution of populations due to chance is
A. gene flow.
B. genetic drift.
C. natural selection.
D. genetic variation.
E. has more effect in large populations than in small populations.
____2. If color is an inherited trait in beetles, and birds are more likely to eat brown beetles than green
beetles,
A. the frequency of the green allele will increase.
B. the frequency of the brown allele will increase.
C. this causes the population to evolve due to gene flow.
D. this causes the population to evolve due to genetic drift.
E. the frequencies of the brown and green alleles will not change.
____3. In a population with brown and green alleles for color, genetic drift
A. has more effect on the evolution of a small population.
B. has more effect on the evolution of a large population.
C. always increases the frequency of brown alleles in the population.
D. causes populations to become better adapted to their environments.
E. occurs when individuals move into or out of a population, changing the allele frequencies in the
population.
____4. Color is an inherited trait in beetles. If brown beetles move into a population from a nearby island,
which of the following statements is correct?
A. This is an example of genetic drift.
B. Gene flow causes the frequency of the green allele to increase.
C. Gene flow causes the frequency of the brown allele to increase.
D. Natural selection causes the frequency of the green allele to increase.
E. Natural selection causes the frequency of the brown allele to increase.
____5. Remember that color is an inherited trait in beetles. Which of the following is an example of natural
selection?
A. Green beetles migrate out of the population.
B. A storm kills more green beetles than brown beetles by chance.
C. Green beetles and brown beetles always leave the same number of offspring.
D. Green beetles migrate out of the population, and brown beetles migrate into the population.
E. Green beetles leave more offspring than brown beetles because they are better at finding food.