Biology 102 Final Exam: BIOD 102 Final Exam Study Guide:
Complete Solution: Questions &Answers
MODULE 1: EVOLUTION
Question 1: What is natural selection? What is the typical 'selecting force' for
natural selection?
Answer: Natural selection is the process by which organisms with traits better
suited to their environment survive and reproduce more successfully. The typical
selecting force is the environment (including climate, predators, food availability,
disease, and other biotic/abiotic factors).
Multiple Choice:
• A) Natural selection is random change in allele frequencies; the selecting
force is mutation
• B) Natural selection is survival of the fittest driven by environmental
pressures ✓
• C) Natural selection only occurs in response to human intervention
• D) Natural selection eliminates all weak organisms regardless of traits
Rationale: Natural selection requires variation, heritability, and differential
reproductive success. Environmental pressures act as the selective agent, favoring
advantageous traits. Unlike genetic drift (random), natural selection is directional
and adaptive.
,Question 2: What is the definition of 'fitness' and how is it determined?
Answer: Fitness is the ability of an organism to survive and produce fertile
offspring that survive to reproduce. It is determined by reproductive success—the
number of viable, fertile offspring an individual contributes to the next generation
relative to others.
Multiple Choice:
• A) Fitness is physical strength and speed
• B) Fitness is the ability to live the longest
• C) Fitness is reproductive success measured by viable offspring produced ✓
• D) Fitness is determined solely by body size
Rationale: Fitness is about passing genes to the next generation, not individual
survival or strength. An organism that produces many surviving offspring has high
fitness, regardless of other traits.
Question 3: Distinguish natural versus artificial selection.
Answer:
• Natural selection: Environmental pressures determine which traits are
favored; occurs without human intervention.
• Artificial selection: Humans intentionally breed organisms for desired traits
(agriculture, pets, research).
,Multiple Choice:
• A) Natural selection occurs in nature; artificial selection occurs only in zoos
• B) Natural selection is driven by humans; artificial selection is driven by
nature
• C) Natural selection is driven by environmental pressures; artificial selection
is driven by human choice ✓
• D) There is no difference between them
Rationale: The selective agent is the key difference—nature versus humans.
Artificial selection has produced domesticated plants and animals through
controlled breeding.
Question 4: Compare homologous versus analogous structures. WHICH ONES
INDICATE COMMON ANCESTRY?
Answer:
• Homologous structures: Same evolutionary origin, different functions
(human arm, whale flipper, bat wing) → INDICATE COMMON ANCESTRY
• Analogous structures: Same function, different evolutionary origins (bird
wing, insect wing) → DO NOT indicate common ancestry
Multiple Choice:
• A) Both indicate common ancestry
• B) Neither indicates common ancestry
, • C) Homologous structures indicate common ancestry; analogous structures
do not ✓
• D) Analogous structures indicate common ancestry; homologous structures
do not
Rationale: Homologies reveal shared descent because the underlying structure is
inherited from a common ancestor. Analogies arise through convergent evolution
where similar environmental pressures produce similar adaptations
independently.
Question 5: What are the different types of evidence that support the theory of
evolution? (hint: ABEFG)
Answer: A = Anatomical (comparative anatomy), B = Biogeography, E =
Embryology, F = Fossils, G = Genetics/DNA.
Multiple Choice:
• A) Astronomy, Botany, Ecology, Fossils, Geology
• B) Anatomy, Biogeography, Embryology, Fossils, Genetics ✓
• C) Anatomy, Botany, Ecology, Fungi, Genetics
• D) Adaptation, Behavior, Ecology, Fossils, Geography
Rationale: Each line of evidence independently supports evolution, forming a
robust case. Fossils show change over time, anatomy shows structural
relationships, biogeography shows distribution patterns consistent with common
Complete Solution: Questions &Answers
MODULE 1: EVOLUTION
Question 1: What is natural selection? What is the typical 'selecting force' for
natural selection?
Answer: Natural selection is the process by which organisms with traits better
suited to their environment survive and reproduce more successfully. The typical
selecting force is the environment (including climate, predators, food availability,
disease, and other biotic/abiotic factors).
Multiple Choice:
• A) Natural selection is random change in allele frequencies; the selecting
force is mutation
• B) Natural selection is survival of the fittest driven by environmental
pressures ✓
• C) Natural selection only occurs in response to human intervention
• D) Natural selection eliminates all weak organisms regardless of traits
Rationale: Natural selection requires variation, heritability, and differential
reproductive success. Environmental pressures act as the selective agent, favoring
advantageous traits. Unlike genetic drift (random), natural selection is directional
and adaptive.
,Question 2: What is the definition of 'fitness' and how is it determined?
Answer: Fitness is the ability of an organism to survive and produce fertile
offspring that survive to reproduce. It is determined by reproductive success—the
number of viable, fertile offspring an individual contributes to the next generation
relative to others.
Multiple Choice:
• A) Fitness is physical strength and speed
• B) Fitness is the ability to live the longest
• C) Fitness is reproductive success measured by viable offspring produced ✓
• D) Fitness is determined solely by body size
Rationale: Fitness is about passing genes to the next generation, not individual
survival or strength. An organism that produces many surviving offspring has high
fitness, regardless of other traits.
Question 3: Distinguish natural versus artificial selection.
Answer:
• Natural selection: Environmental pressures determine which traits are
favored; occurs without human intervention.
• Artificial selection: Humans intentionally breed organisms for desired traits
(agriculture, pets, research).
,Multiple Choice:
• A) Natural selection occurs in nature; artificial selection occurs only in zoos
• B) Natural selection is driven by humans; artificial selection is driven by
nature
• C) Natural selection is driven by environmental pressures; artificial selection
is driven by human choice ✓
• D) There is no difference between them
Rationale: The selective agent is the key difference—nature versus humans.
Artificial selection has produced domesticated plants and animals through
controlled breeding.
Question 4: Compare homologous versus analogous structures. WHICH ONES
INDICATE COMMON ANCESTRY?
Answer:
• Homologous structures: Same evolutionary origin, different functions
(human arm, whale flipper, bat wing) → INDICATE COMMON ANCESTRY
• Analogous structures: Same function, different evolutionary origins (bird
wing, insect wing) → DO NOT indicate common ancestry
Multiple Choice:
• A) Both indicate common ancestry
• B) Neither indicates common ancestry
, • C) Homologous structures indicate common ancestry; analogous structures
do not ✓
• D) Analogous structures indicate common ancestry; homologous structures
do not
Rationale: Homologies reveal shared descent because the underlying structure is
inherited from a common ancestor. Analogies arise through convergent evolution
where similar environmental pressures produce similar adaptations
independently.
Question 5: What are the different types of evidence that support the theory of
evolution? (hint: ABEFG)
Answer: A = Anatomical (comparative anatomy), B = Biogeography, E =
Embryology, F = Fossils, G = Genetics/DNA.
Multiple Choice:
• A) Astronomy, Botany, Ecology, Fossils, Geology
• B) Anatomy, Biogeography, Embryology, Fossils, Genetics ✓
• C) Anatomy, Botany, Ecology, Fungi, Genetics
• D) Adaptation, Behavior, Ecology, Fossils, Geography
Rationale: Each line of evidence independently supports evolution, forming a
robust case. Fossils show change over time, anatomy shows structural
relationships, biogeography shows distribution patterns consistent with common
