BIOL180 Lesson 7 Quiz Evolution and
Natural Selection Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
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1. Which statement best defines biological evolution?
A. The development of an individual organism during its lifetime
B. The process by which organisms intentionally change to survive
C. The study of how ecosystems remain balanced
D. A change in the inherited characteristics of populations over
generations
Answer: D. A change in the inherited characteristics of populations
over generations
Rationale: Evolution occurs at the population level when the
frequencies of inherited traits or alleles change across generations.
Individual organisms do not evolve during their lifetimes in the
biological sense. Instead, evolutionary change results from
mechanisms such as natural selection, mutation, genetic drift, and
gene flow.
2. Who is most closely associated with the theory of evolution by
natural selection?
A. Charles Darwin
B. Gregor Mendel
C. Robert Hooke
D. Louis Pasteur
,Answer: A. Charles Darwin
Rationale: Charles Darwin developed the theory of evolution by
natural selection and presented extensive evidence supporting it.
Alfred Russel Wallace independently developed a similar explanation
at approximately the same time. Mendel is primarily associated with
the principles of heredity.
3. What is natural selection?
A. A process in which organisms consciously choose favorable traits
B. A process that causes all organisms to become more complex
C. A process in which individuals with advantageous heritable traits
tend to leave more offspring
D. A process that prevents genetic variation
Answer: C. A process in which individuals with advantageous
heritable traits tend to leave more offspring
Rationale: Natural selection occurs when individuals vary in heritable
characteristics and those characteristics affect survival or reproductive
success. Individuals with traits that provide an advantage in a
particular environment are more likely to reproduce and pass those
traits to subsequent generations.
4. Which condition is necessary for natural selection to produce
evolutionary change?
A. All individuals must have identical traits
B. Traits must vary among individuals and at least some variation
must be heritable
C. Organisms must consciously select their mates
D. Mutations must always be beneficial
,Answer: B. Traits must vary among individuals and at least some
variation must be heritable
Rationale: Natural selection requires variation, inheritance, and
differences in reproductive success. If a trait does not vary or cannot
be inherited, selection cannot cause that trait to become more common
in a population over generations.
5. What does the term adaptation refer to in evolutionary biology?
A. A temporary response of an individual to its surroundings
B. An organism's decision to change its behavior
C. A characteristic acquired through exercise
D. An inherited characteristic that increases reproductive success in
a particular environment
Answer: D. An inherited characteristic that increases reproductive
success in a particular environment
Rationale: An adaptation is an inherited characteristic that has become
common because it improves an organism's ability to survive or
reproduce in a particular environment. Acclimation, learning, or
temporary physiological responses are not necessarily evolutionary
adaptations.
6. Which observation was important to Darwin's development of
natural selection?
A. Individuals within populations vary in their characteristics
B. All organisms are genetically identical
C. Acquired characteristics are always inherited
D. Populations remain unchanged over time
Answer: A. Individuals within populations vary in their
characteristics
, Rationale: Variation within populations is essential to natural
selection. Darwin recognized that members of the same species can
differ in characteristics such as size, coloration, behavior, and physical
structure. When some variations influence reproductive success and
are heritable, natural selection can change populations over
generations.
7. What is meant by differential reproductive success?
A. Every individual produces exactly the same number of offspring
B. Some individuals leave more surviving, reproductively successful
offspring than others
C. Organisms reproduce only when environmental conditions are perfect
D. All organisms reproduce at the same age
Answer: B. Some individuals leave more surviving, reproductively
successful offspring than others
Rationale: Differential reproductive success means that individuals
differ in how successfully they contribute genes to future generations.
Natural selection favors heritable traits associated with greater
reproductive success, causing those traits to become more frequent in
a population.
8. Why is genetic variation important to evolution?
A. It prevents populations from adapting
B. It guarantees that every organism survives
C. It provides differences upon which evolutionary mechanisms can
act
D. It eliminates mutations
Answer: C. It provides differences upon which evolutionary
mechanisms can act
Natural Selection Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
1. Which statement best defines biological evolution?
A. The development of an individual organism during its lifetime
B. The process by which organisms intentionally change to survive
C. The study of how ecosystems remain balanced
D. A change in the inherited characteristics of populations over
generations
Answer: D. A change in the inherited characteristics of populations
over generations
Rationale: Evolution occurs at the population level when the
frequencies of inherited traits or alleles change across generations.
Individual organisms do not evolve during their lifetimes in the
biological sense. Instead, evolutionary change results from
mechanisms such as natural selection, mutation, genetic drift, and
gene flow.
2. Who is most closely associated with the theory of evolution by
natural selection?
A. Charles Darwin
B. Gregor Mendel
C. Robert Hooke
D. Louis Pasteur
,Answer: A. Charles Darwin
Rationale: Charles Darwin developed the theory of evolution by
natural selection and presented extensive evidence supporting it.
Alfred Russel Wallace independently developed a similar explanation
at approximately the same time. Mendel is primarily associated with
the principles of heredity.
3. What is natural selection?
A. A process in which organisms consciously choose favorable traits
B. A process that causes all organisms to become more complex
C. A process in which individuals with advantageous heritable traits
tend to leave more offspring
D. A process that prevents genetic variation
Answer: C. A process in which individuals with advantageous
heritable traits tend to leave more offspring
Rationale: Natural selection occurs when individuals vary in heritable
characteristics and those characteristics affect survival or reproductive
success. Individuals with traits that provide an advantage in a
particular environment are more likely to reproduce and pass those
traits to subsequent generations.
4. Which condition is necessary for natural selection to produce
evolutionary change?
A. All individuals must have identical traits
B. Traits must vary among individuals and at least some variation
must be heritable
C. Organisms must consciously select their mates
D. Mutations must always be beneficial
,Answer: B. Traits must vary among individuals and at least some
variation must be heritable
Rationale: Natural selection requires variation, inheritance, and
differences in reproductive success. If a trait does not vary or cannot
be inherited, selection cannot cause that trait to become more common
in a population over generations.
5. What does the term adaptation refer to in evolutionary biology?
A. A temporary response of an individual to its surroundings
B. An organism's decision to change its behavior
C. A characteristic acquired through exercise
D. An inherited characteristic that increases reproductive success in
a particular environment
Answer: D. An inherited characteristic that increases reproductive
success in a particular environment
Rationale: An adaptation is an inherited characteristic that has become
common because it improves an organism's ability to survive or
reproduce in a particular environment. Acclimation, learning, or
temporary physiological responses are not necessarily evolutionary
adaptations.
6. Which observation was important to Darwin's development of
natural selection?
A. Individuals within populations vary in their characteristics
B. All organisms are genetically identical
C. Acquired characteristics are always inherited
D. Populations remain unchanged over time
Answer: A. Individuals within populations vary in their
characteristics
, Rationale: Variation within populations is essential to natural
selection. Darwin recognized that members of the same species can
differ in characteristics such as size, coloration, behavior, and physical
structure. When some variations influence reproductive success and
are heritable, natural selection can change populations over
generations.
7. What is meant by differential reproductive success?
A. Every individual produces exactly the same number of offspring
B. Some individuals leave more surviving, reproductively successful
offspring than others
C. Organisms reproduce only when environmental conditions are perfect
D. All organisms reproduce at the same age
Answer: B. Some individuals leave more surviving, reproductively
successful offspring than others
Rationale: Differential reproductive success means that individuals
differ in how successfully they contribute genes to future generations.
Natural selection favors heritable traits associated with greater
reproductive success, causing those traits to become more frequent in
a population.
8. Why is genetic variation important to evolution?
A. It prevents populations from adapting
B. It guarantees that every organism survives
C. It provides differences upon which evolutionary mechanisms can
act
D. It eliminates mutations
Answer: C. It provides differences upon which evolutionary
mechanisms can act
