BIOL 1009 GENERAL BIOLOGY FINAL EXAM LATEST PREP TEST BANK
WITH 100 EXAM QUESTIONS AND CORRECT ANSWERS GRADED A+
UMN / UNIVERSITY OF MINNESOTA 2026-2027 UPDATE
1: Which of the following best describes the role of mutation in
microevolutionary change?
A. It creates large, immediate shifts in allele frequencies
B. It introduces new alleles but causes small changes in allele frequencies over
one generation
C. It is a non-random process that always improves fitness
D. It prevents gene flow between populations
-ANSWER- B
Rationale: Mutations are the ultimate source of new genetic variation. However,
because they occur rarely, they only cause small changes in allele frequencies
within a single generation.
2: What is the primary mechanism that results in the random fluctuation of
allele frequencies in a small population?
A. Gene flow
B. Natural selection
C. Genetic drift
D. Mutation
-ANSWER- C
Rationale: Genetic drift is defined as the random change in allele frequencies due
to chance events, and its effects are most pronounced in small populations.
3: A population of birds is split by a new mountain range. Over thousands of
years, the two groups become different species. What type of speciation is this?
A. Sympatric speciation
B. Allopatric speciation
C. Parapatric speciation
,D. Polyploid speciation
-ANSWER- B
Rationale: Allopatric speciation occurs when a physical barrier geographically
isolates populations, preventing gene flow and leading to reproductive isolation.
4: Which of the following is true regarding the Hardy-Weinberg equilibrium?
A. It describes a population that is actively evolving
B. It requires natural selection to be occurring
C. It states that allele frequencies in a population will remain constant if specific
conditions are met
D. It applies only to sexually reproducing diploid organisms with high mutation
rates
-ANSWER- C
Rationale: The Hardy-Weinberg principle states that allele and genotype
frequencies in a population will remain constant from generation to generation in
the absence of evolutionary influences.
5: What is the defining characteristic of a homologous structure?
A. It serves the same function in different species but has different anatomical
origins
B. It is a vestigial structure with no current function
C. It shares a common evolutionary origin but may serve different functions
D. It is found only in analogous species
-ANSWER- C
Rationale: Homologous structures are anatomical features that share a common
ancestry, even if they have evolved to serve different functions in different
species.
6: Which type of selection favors individuals at both extremes of the phenotypic
range?
A. Stabilizing selection
B. Directional selection
C. Disruptive selection
D. Artificial selection
, -ANSWER- C
Rationale: Disruptive selection favors extreme phenotypes over intermediate
phenotypes, potentially leading to speciation.
7: In a population of flowers, red and white alleles exhibit incomplete
dominance. What is the expected phenotype ratio in the F2 generation of a
cross between a red flower and a white flower?
A. 1 red : 2 pink : 1 white
B. 3 red : 1 white
C. 1 red : 1 white
D. 9 red : 3 pink : 4 white
-ANSWER- A
Rationale: Incomplete dominance results in a blending of phenotypes in the
heterozygote. The F1 generation would be all pink, and the F2 generation would
yield a 1:2:1 ratio of red:pink:white.
8: Which of the following best describes the process of translation?
A. The synthesis of mRNA from a DNA template
B. The synthesis of a polypeptide chain from an mRNA template
C. The replication of DNA prior to cell division
D. The modification of mRNA before it leaves the nucleus
-ANSWER- B
Rationale: Translation is the process by which ribosomes synthesize proteins using
the genetic information carried by mRNA.
9: What is the function of the enzyme helicase during DNA replication?
A. It joins Okazaki fragments together
B. It synthesizes the new DNA strands
C. It unwinds the double helix at the replication fork
D. It proofreads the newly synthesized DNA
-ANSWER- C
Rationale: Helicase is responsible for unwinding the DNA double helix by breaking
the hydrogen bonds between complementary base pairs.
WITH 100 EXAM QUESTIONS AND CORRECT ANSWERS GRADED A+
UMN / UNIVERSITY OF MINNESOTA 2026-2027 UPDATE
1: Which of the following best describes the role of mutation in
microevolutionary change?
A. It creates large, immediate shifts in allele frequencies
B. It introduces new alleles but causes small changes in allele frequencies over
one generation
C. It is a non-random process that always improves fitness
D. It prevents gene flow between populations
-ANSWER- B
Rationale: Mutations are the ultimate source of new genetic variation. However,
because they occur rarely, they only cause small changes in allele frequencies
within a single generation.
2: What is the primary mechanism that results in the random fluctuation of
allele frequencies in a small population?
A. Gene flow
B. Natural selection
C. Genetic drift
D. Mutation
-ANSWER- C
Rationale: Genetic drift is defined as the random change in allele frequencies due
to chance events, and its effects are most pronounced in small populations.
3: A population of birds is split by a new mountain range. Over thousands of
years, the two groups become different species. What type of speciation is this?
A. Sympatric speciation
B. Allopatric speciation
C. Parapatric speciation
,D. Polyploid speciation
-ANSWER- B
Rationale: Allopatric speciation occurs when a physical barrier geographically
isolates populations, preventing gene flow and leading to reproductive isolation.
4: Which of the following is true regarding the Hardy-Weinberg equilibrium?
A. It describes a population that is actively evolving
B. It requires natural selection to be occurring
C. It states that allele frequencies in a population will remain constant if specific
conditions are met
D. It applies only to sexually reproducing diploid organisms with high mutation
rates
-ANSWER- C
Rationale: The Hardy-Weinberg principle states that allele and genotype
frequencies in a population will remain constant from generation to generation in
the absence of evolutionary influences.
5: What is the defining characteristic of a homologous structure?
A. It serves the same function in different species but has different anatomical
origins
B. It is a vestigial structure with no current function
C. It shares a common evolutionary origin but may serve different functions
D. It is found only in analogous species
-ANSWER- C
Rationale: Homologous structures are anatomical features that share a common
ancestry, even if they have evolved to serve different functions in different
species.
6: Which type of selection favors individuals at both extremes of the phenotypic
range?
A. Stabilizing selection
B. Directional selection
C. Disruptive selection
D. Artificial selection
, -ANSWER- C
Rationale: Disruptive selection favors extreme phenotypes over intermediate
phenotypes, potentially leading to speciation.
7: In a population of flowers, red and white alleles exhibit incomplete
dominance. What is the expected phenotype ratio in the F2 generation of a
cross between a red flower and a white flower?
A. 1 red : 2 pink : 1 white
B. 3 red : 1 white
C. 1 red : 1 white
D. 9 red : 3 pink : 4 white
-ANSWER- A
Rationale: Incomplete dominance results in a blending of phenotypes in the
heterozygote. The F1 generation would be all pink, and the F2 generation would
yield a 1:2:1 ratio of red:pink:white.
8: Which of the following best describes the process of translation?
A. The synthesis of mRNA from a DNA template
B. The synthesis of a polypeptide chain from an mRNA template
C. The replication of DNA prior to cell division
D. The modification of mRNA before it leaves the nucleus
-ANSWER- B
Rationale: Translation is the process by which ribosomes synthesize proteins using
the genetic information carried by mRNA.
9: What is the function of the enzyme helicase during DNA replication?
A. It joins Okazaki fragments together
B. It synthesizes the new DNA strands
C. It unwinds the double helix at the replication fork
D. It proofreads the newly synthesized DNA
-ANSWER- C
Rationale: Helicase is responsible for unwinding the DNA double helix by breaking
the hydrogen bonds between complementary base pairs.
