Ohio State EEOB 3310 Evolution and Ecology Exam
Questions 2027 – Natural Selection Dynamics and
Population Ecology
ABSTRACT
This comprehensive question bank has been developed for students preparing for the
EEOB 3310 Evolution and Ecology Final Examination at The Ohio State University during
the 2027 academic year. EEOB 3310 is a 4-credit core course required for the Evolution
& Ecology Major Program, covering the fundamental principles of evolutionary biology
and ecological dynamics . The 200 multiple-choice questions are organized into six
major content areas aligned with the official course syllabus: Natural Selection
Fundamentals & Modes of Selection (35 questions), Population Genetics & Hardy-
Weinberg Equilibrium (35 questions), Genetic Drift & Gene Flow (30 questions),
Phylogenetics & Speciation (35 questions), Population Ecology & Growth Models (35
questions), and Community & Ecosystem Ecology (30 questions). Each question includes
a detailed Rationale emphasizing evolutionary mechanisms, quantitative problem-
solving, and ecological applications essential for understanding natural selection
dynamics and population ecology .
SECTION A: NATURAL SELECTION FUNDAMENTALS & MODES OF
SELECTION (Questions 1-35)
1. What is the best definition of biological evolution?
,A) Individual development over a lifetime
B) A change in allele frequency in a population over time
C) Ecosystem change due to climate
D) Cultural evolution in human societies
Answer: B
Rationale: Biological evolution is defined as a change in allele frequency in a population
over time. Individual development is ontogeny, not evolution. Evolution occurs at the
population level across generations .
2. Which of the following is NOT one of the four mechanisms by which evolution
can occur?
A) Mutation
B) Genetic drift
C) Gene flow
D) Individual development
Answer: D
Rationale: The four mechanisms of evolution are mutation, genetic drift, gene flow
(migration), and natural selection. Individual development is not a mechanism of
evolution because changes acquired during an individual's lifetime are not inherited .
3. What are Darwin's four postulates of natural selection?
A) Variation, inheritance, differential survival, extinction
B) Mutation, migration, genetic drift, selection
,C) Gradualism, uniformitarianism, essentialism, transformism
D) Competition, cooperation, adaptation, extinction
Answer: A
Rationale: Darwin's four postulates of natural selection are: variation (individuals differ),
inheritance (traits are passed to offspring), differential survival (some individuals survive
better), and extinction (those that don't survive die) .
4. What is directional selection?
A) Selection that favors individuals at one extreme of the range of phenotypes
B) Selection that favors average phenotypes
C) Selection that favors both extremes of the range
D) Selection that favors rare phenotypes
Answer: A
Rationale: Directional selection occurs when individuals at one extreme of the range of
phenotypes are fittest. Directional selection reduces variation in a population .
5. What is stabilizing selection?
A) Selection that favors individuals at one extreme of the range of phenotypes
B) Selection that favors average phenotypes
C) Selection that favors both extremes of the range
D) Selection that favors rare phenotypes
Answer: B
Rationale: Stabilizing selection (also called balancing selection) selects for common
, phenotypes in a population. The fitness of a phenotype increases with its frequency.
Stabilizing selection reduces variation .
6. What is disruptive selection?
A) Selection that favors individuals at one extreme of the range of phenotypes
B) Selection that favors average phenotypes
C) Selection that favors two or more discontinuous phenotypes at the extremes
D) Selection that favors rare phenotypes
Answer: C
Rationale: Disruptive selection is considered disruptive if 2 or more discontinuous
phenotypes are fittest. Disruptive selection preserves variation and can potentially lead
to speciation .
7. What is negative frequency-dependent selection?
A) Selection that favors common phenotypes
B) Selection that favors rare phenotypes
C) Selection that favors average phenotypes
D) Selection that favors one extreme phenotype
Answer: B
Rationale: Negative frequency-dependent selection selects for rare phenotypes in a
population. The fitness of a phenotype increases with its frequency. This type of
selection preserves variation .
Questions 2027 – Natural Selection Dynamics and
Population Ecology
ABSTRACT
This comprehensive question bank has been developed for students preparing for the
EEOB 3310 Evolution and Ecology Final Examination at The Ohio State University during
the 2027 academic year. EEOB 3310 is a 4-credit core course required for the Evolution
& Ecology Major Program, covering the fundamental principles of evolutionary biology
and ecological dynamics . The 200 multiple-choice questions are organized into six
major content areas aligned with the official course syllabus: Natural Selection
Fundamentals & Modes of Selection (35 questions), Population Genetics & Hardy-
Weinberg Equilibrium (35 questions), Genetic Drift & Gene Flow (30 questions),
Phylogenetics & Speciation (35 questions), Population Ecology & Growth Models (35
questions), and Community & Ecosystem Ecology (30 questions). Each question includes
a detailed Rationale emphasizing evolutionary mechanisms, quantitative problem-
solving, and ecological applications essential for understanding natural selection
dynamics and population ecology .
SECTION A: NATURAL SELECTION FUNDAMENTALS & MODES OF
SELECTION (Questions 1-35)
1. What is the best definition of biological evolution?
,A) Individual development over a lifetime
B) A change in allele frequency in a population over time
C) Ecosystem change due to climate
D) Cultural evolution in human societies
Answer: B
Rationale: Biological evolution is defined as a change in allele frequency in a population
over time. Individual development is ontogeny, not evolution. Evolution occurs at the
population level across generations .
2. Which of the following is NOT one of the four mechanisms by which evolution
can occur?
A) Mutation
B) Genetic drift
C) Gene flow
D) Individual development
Answer: D
Rationale: The four mechanisms of evolution are mutation, genetic drift, gene flow
(migration), and natural selection. Individual development is not a mechanism of
evolution because changes acquired during an individual's lifetime are not inherited .
3. What are Darwin's four postulates of natural selection?
A) Variation, inheritance, differential survival, extinction
B) Mutation, migration, genetic drift, selection
,C) Gradualism, uniformitarianism, essentialism, transformism
D) Competition, cooperation, adaptation, extinction
Answer: A
Rationale: Darwin's four postulates of natural selection are: variation (individuals differ),
inheritance (traits are passed to offspring), differential survival (some individuals survive
better), and extinction (those that don't survive die) .
4. What is directional selection?
A) Selection that favors individuals at one extreme of the range of phenotypes
B) Selection that favors average phenotypes
C) Selection that favors both extremes of the range
D) Selection that favors rare phenotypes
Answer: A
Rationale: Directional selection occurs when individuals at one extreme of the range of
phenotypes are fittest. Directional selection reduces variation in a population .
5. What is stabilizing selection?
A) Selection that favors individuals at one extreme of the range of phenotypes
B) Selection that favors average phenotypes
C) Selection that favors both extremes of the range
D) Selection that favors rare phenotypes
Answer: B
Rationale: Stabilizing selection (also called balancing selection) selects for common
, phenotypes in a population. The fitness of a phenotype increases with its frequency.
Stabilizing selection reduces variation .
6. What is disruptive selection?
A) Selection that favors individuals at one extreme of the range of phenotypes
B) Selection that favors average phenotypes
C) Selection that favors two or more discontinuous phenotypes at the extremes
D) Selection that favors rare phenotypes
Answer: C
Rationale: Disruptive selection is considered disruptive if 2 or more discontinuous
phenotypes are fittest. Disruptive selection preserves variation and can potentially lead
to speciation .
7. What is negative frequency-dependent selection?
A) Selection that favors common phenotypes
B) Selection that favors rare phenotypes
C) Selection that favors average phenotypes
D) Selection that favors one extreme phenotype
Answer: B
Rationale: Negative frequency-dependent selection selects for rare phenotypes in a
population. The fitness of a phenotype increases with its frequency. This type of
selection preserves variation .
