AP®︎ Biology: Topic 7.4 Practice Test
Prepare for your quiz, test, or the AP exam with focused practice questions on Topic 7.4 of AP Biology – Population Genetics.
Questions List
Topic 7.4
Question 1 Easy
This question tests the following: EVO-1.H.1
What is the ultimate source of genetic variation in a population?
What You’re Being Tested On:
Explore the learning objectives taken directly from the College Board’s AP® Biology Curriculum. Ensure you’re prepared for the exact topics covered on the AP® exam, in-class tests, and quizzes, and gain confidence in your mastery of the material.
Topic 7.4: Population Genetics
Learning Objective: 7.4.A
Explain how random occurrences affect the genetic makeup of a population.
Essential Knowledge: 7.4.A.1
Evolution is also driven by random occurrences. i. Mutation is a random process that adds new genetic variation to a population. ii. Genetic drift is a change in allele frequencies attributable to a nonselective process occurring in small populations. iii. The bottleneck effect is a type of genetic drift that occurs when a population size is reduced to a small number of individuals for at least one generation. iv. The founder effect is a type of genetic drift that occurs when a population is separated from other members of the population. The frequency of genes and traits will shift based on the genes in this new founder population. v. Migration can result in gene flow (the addition or removal of alleles from a population).
Learning Objective: 7.4.B
Describe the role of random processes in the evolution of specific populations.
Essential Knowledge: 7.4.B.1
Random processes can lead to changes in allele frequencies in a population. i. Mutations result in genetic variation, which provides phenotypes on which natural selection acts. ii. Genetic drift can allow a small population to diverge from other populations of the same species. iii. Gene flow between two populations prevents them from diverging into separate species.
Learning Objective: 7.4.C
Describe the change in the genetic makeup of a population over time.
Essential Knowledge: 7.4.C.1
Changes in allele frequencies provide evidence for the occurrence of evolution in a population.
