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BIOL 320 Final Exam 2025 – Comprehensive Study Guide, Practice
Questions, and Answer Key for Molecular and Cellular Biology
Ace your BIOL 320 Final Exam 2025 with this complete study guide and answer key.
Includes detailed review notes, practice tests, and exam questions covering molecular biology,
cell physiology, and genetics. Perfect for college and university biology students preparing for
the BIOL 320 comprehensive final exam. Boost your grade with trusted resources and expert-
verified explanations.
BIOL 320 Final Exam,
BIOL 320 study guide,
BIOL 320 final exam answers
In a heterzygote advantage situation, a less fit or lethal allele remains in the population at _______ than
expected frequencies. This is because the homozygous genotypes both have _______ fitness than
heterozygous genotype. - ANSWER-higher
lower
In a situation where frequency dependent selection is occurring, the more rare a phenotype is in the
population, the _______ its relative fitness. Also, as the frequency of the rare phenotype increases, its
relative fitness _______.
Answer 1: - ANSWER-higher
decreases
When selection favors homozygous genotypes over heterozygous genotypes (i.e., heterozygote
disadvantage)... - ANSWER-the most common allele will typically become fixed (will increase to a
frequency of 1.0) in the population.
If migration proceeds unopposed by any other evolutionary processes, the result will be - ANSWER-
homogenization of allele frequencies among the populations involved
, 2|Page
"If a population is not in Hardy-Weinberg equilibrium..."? - ANSWER-the allele and/or genotype
frequencies will change from one generation to the next.
What are true of the process of retroposition and the resulting duplicated genes? - ANSWER-Involves
reverse transcription of mRNA back into DNA.
Includes integration of reverse transcribed DNA back into the genome.
Can often be recognized by the presence of region that codes for a poly-A tail.
The term _______ refers to the physical manifestation of a genotype. - ANSWER-phenotype
Given the genotype frequencies below, determine the observed frequencies of the two alleles in the
population (p and q). Assume the population consists of 100 individuals, and that B = p and b = q.
Observed Genotype frequencies:
BB = 0.39
Bb = 0. 40
bb = 0.21 - ANSWER-Observed Allele frequencies:
p = 0.59
q = 0.41
Using the observed allele frequencies you just calculated above, determine the expected genotype
frequencies in the next generation (assuming no violations of the Hardy-Weinberg principle). - ANSWER-
BB = 0.35
Bb = 0.48
bb = 0.17
Is this population in Hardy-Weinberg equilibrium? - ANSWER-No
One of the most important sources of new genes is likely _______. The most common underlying
mechanism for this process is _______. - ANSWER-gene duplications / unequal crossing-over
BIOL 320 Final Exam 2025 – Comprehensive Study Guide, Practice
Questions, and Answer Key for Molecular and Cellular Biology
Ace your BIOL 320 Final Exam 2025 with this complete study guide and answer key.
Includes detailed review notes, practice tests, and exam questions covering molecular biology,
cell physiology, and genetics. Perfect for college and university biology students preparing for
the BIOL 320 comprehensive final exam. Boost your grade with trusted resources and expert-
verified explanations.
BIOL 320 Final Exam,
BIOL 320 study guide,
BIOL 320 final exam answers
In a heterzygote advantage situation, a less fit or lethal allele remains in the population at _______ than
expected frequencies. This is because the homozygous genotypes both have _______ fitness than
heterozygous genotype. - ANSWER-higher
lower
In a situation where frequency dependent selection is occurring, the more rare a phenotype is in the
population, the _______ its relative fitness. Also, as the frequency of the rare phenotype increases, its
relative fitness _______.
Answer 1: - ANSWER-higher
decreases
When selection favors homozygous genotypes over heterozygous genotypes (i.e., heterozygote
disadvantage)... - ANSWER-the most common allele will typically become fixed (will increase to a
frequency of 1.0) in the population.
If migration proceeds unopposed by any other evolutionary processes, the result will be - ANSWER-
homogenization of allele frequencies among the populations involved
, 2|Page
"If a population is not in Hardy-Weinberg equilibrium..."? - ANSWER-the allele and/or genotype
frequencies will change from one generation to the next.
What are true of the process of retroposition and the resulting duplicated genes? - ANSWER-Involves
reverse transcription of mRNA back into DNA.
Includes integration of reverse transcribed DNA back into the genome.
Can often be recognized by the presence of region that codes for a poly-A tail.
The term _______ refers to the physical manifestation of a genotype. - ANSWER-phenotype
Given the genotype frequencies below, determine the observed frequencies of the two alleles in the
population (p and q). Assume the population consists of 100 individuals, and that B = p and b = q.
Observed Genotype frequencies:
BB = 0.39
Bb = 0. 40
bb = 0.21 - ANSWER-Observed Allele frequencies:
p = 0.59
q = 0.41
Using the observed allele frequencies you just calculated above, determine the expected genotype
frequencies in the next generation (assuming no violations of the Hardy-Weinberg principle). - ANSWER-
BB = 0.35
Bb = 0.48
bb = 0.17
Is this population in Hardy-Weinberg equilibrium? - ANSWER-No
One of the most important sources of new genes is likely _______. The most common underlying
mechanism for this process is _______. - ANSWER-gene duplications / unequal crossing-over
