1
BIOLOGY 2 EXAM 1 PALMTAG FGCU Actual
Exam 2026/2027 Complete Questions and
Verified Answers with Detailed Rationales Pass
Guaranteed - A+ Graded
Section 1: Biology 2 Exam 1
Q1: Which of the following best defines evolution?
A. The process by which organisms develop new traits during their lifetime
B. The change in allele frequencies in a population over time [CORRECT]
C. The improvement of species toward a more perfect form
D. The inheritance of acquired characteristics from parents to offspring
Correct Answer: B
Rationale: Evolution is defined as the change in allele frequencies in a population over time,
which is the modern synthesis definition combining Mendelian genetics with Darwinian natural
selection.
Q2: In a population of 1000 individuals, 160 show the recessive phenotype. Assuming Hardy-
Weinberg equilibrium, what is the frequency of the heterozygous genotype?
A. 0.16
B. 0.36
C. 0.48 [CORRECT]
D. 0.64
Correct Answer: C
Rationale: q² = 160/1000 = 0.16, so q = 0.4 and p = 0.6. The heterozygous frequency is 2pq =
2(0.6)(0.4) = 0.48.
Q3: Which evolutionary mechanism consistently results in a loss of genetic variation from
populations?
A. Mutation
B. Gene flow
,2
C. Genetic drift [CORRECT]
D. Recombination
Correct Answer: C
Rationale: Genetic drift causes random changes in allele frequencies, particularly in small
populations, and consistently leads to a loss of genetic variation as alleles become fixed or lost.
Q4: The biological species concept defines species based on:
A. Morphological similarity
B. Ecological niche occupation
C. Reproductive isolation [CORRECT]
D. Genetic distance
Correct Answer: C
Rationale: Ernst Mayr's biological species concept defines species as groups of actually or
potentially interbreeding natural populations that are reproductively isolated from other such
groups.
Q5: Prezygotic isolation mechanisms include all of the following EXCEPT:
A. Temporal isolation
B. Behavioral isolation
C. Hybrid inviability [CORRECT]
D. Mechanical isolation
Correct Answer: C
Rationale: Hybrid inviability is a postzygotic isolation mechanism that occurs after fertilization,
preventing the hybrid zygote from developing into a viable offspring.
Q6: In a population at Hardy-Weinberg equilibrium, if the frequency of the dominant allele is
0.7, what percentage of the population is homozygous dominant?
A. 7%
B. 21%
C. 49% [CORRECT]
D. 70%
Correct Answer: C
, 3
Rationale: p = 0.7, so p² (frequency of homozygous dominant) = (0.7)² = 0.49 or 49%.
Q7: Which of the following is NOT a requirement for Hardy-Weinberg equilibrium?
A. No mutation
B. Random mating
C. Natural selection [CORRECT]
D. Large population size
Correct Answer: C
Rationale: Hardy-Weinberg equilibrium requires no evolutionary forces acting on the population,
including no natural selection, which would cause non-random changes in allele frequencies.
Q8: Allopatric speciation occurs when:
A. New species form in the same geographic area
B. Populations are separated by a geographic barrier [CORRECT]
C. Polyploidy occurs within a single generation
D. Hybrid zones form between adjacent populations
Correct Answer: B
Rationale: Allopatric speciation (allo = other, patric = place) occurs when populations are
geographically isolated from one another, preventing gene flow.
Q9: The founder effect is a type of:
A. Natural selection
B. Gene flow
C. Genetic drift [CORRECT]
D. Mutation
Correct Answer: C
Rationale: The founder effect is a special case of genetic drift where a new population is
established by a small number of individuals carrying only a fraction of the original population's
genetic variation.
Q10: Which pattern of natural selection favors intermediate phenotypes over extreme forms?
A. Directional selection
BIOLOGY 2 EXAM 1 PALMTAG FGCU Actual
Exam 2026/2027 Complete Questions and
Verified Answers with Detailed Rationales Pass
Guaranteed - A+ Graded
Section 1: Biology 2 Exam 1
Q1: Which of the following best defines evolution?
A. The process by which organisms develop new traits during their lifetime
B. The change in allele frequencies in a population over time [CORRECT]
C. The improvement of species toward a more perfect form
D. The inheritance of acquired characteristics from parents to offspring
Correct Answer: B
Rationale: Evolution is defined as the change in allele frequencies in a population over time,
which is the modern synthesis definition combining Mendelian genetics with Darwinian natural
selection.
Q2: In a population of 1000 individuals, 160 show the recessive phenotype. Assuming Hardy-
Weinberg equilibrium, what is the frequency of the heterozygous genotype?
A. 0.16
B. 0.36
C. 0.48 [CORRECT]
D. 0.64
Correct Answer: C
Rationale: q² = 160/1000 = 0.16, so q = 0.4 and p = 0.6. The heterozygous frequency is 2pq =
2(0.6)(0.4) = 0.48.
Q3: Which evolutionary mechanism consistently results in a loss of genetic variation from
populations?
A. Mutation
B. Gene flow
,2
C. Genetic drift [CORRECT]
D. Recombination
Correct Answer: C
Rationale: Genetic drift causes random changes in allele frequencies, particularly in small
populations, and consistently leads to a loss of genetic variation as alleles become fixed or lost.
Q4: The biological species concept defines species based on:
A. Morphological similarity
B. Ecological niche occupation
C. Reproductive isolation [CORRECT]
D. Genetic distance
Correct Answer: C
Rationale: Ernst Mayr's biological species concept defines species as groups of actually or
potentially interbreeding natural populations that are reproductively isolated from other such
groups.
Q5: Prezygotic isolation mechanisms include all of the following EXCEPT:
A. Temporal isolation
B. Behavioral isolation
C. Hybrid inviability [CORRECT]
D. Mechanical isolation
Correct Answer: C
Rationale: Hybrid inviability is a postzygotic isolation mechanism that occurs after fertilization,
preventing the hybrid zygote from developing into a viable offspring.
Q6: In a population at Hardy-Weinberg equilibrium, if the frequency of the dominant allele is
0.7, what percentage of the population is homozygous dominant?
A. 7%
B. 21%
C. 49% [CORRECT]
D. 70%
Correct Answer: C
, 3
Rationale: p = 0.7, so p² (frequency of homozygous dominant) = (0.7)² = 0.49 or 49%.
Q7: Which of the following is NOT a requirement for Hardy-Weinberg equilibrium?
A. No mutation
B. Random mating
C. Natural selection [CORRECT]
D. Large population size
Correct Answer: C
Rationale: Hardy-Weinberg equilibrium requires no evolutionary forces acting on the population,
including no natural selection, which would cause non-random changes in allele frequencies.
Q8: Allopatric speciation occurs when:
A. New species form in the same geographic area
B. Populations are separated by a geographic barrier [CORRECT]
C. Polyploidy occurs within a single generation
D. Hybrid zones form between adjacent populations
Correct Answer: B
Rationale: Allopatric speciation (allo = other, patric = place) occurs when populations are
geographically isolated from one another, preventing gene flow.
Q9: The founder effect is a type of:
A. Natural selection
B. Gene flow
C. Genetic drift [CORRECT]
D. Mutation
Correct Answer: C
Rationale: The founder effect is a special case of genetic drift where a new population is
established by a small number of individuals carrying only a fraction of the original population's
genetic variation.
Q10: Which pattern of natural selection favors intermediate phenotypes over extreme forms?
A. Directional selection
