BIOD210
Genetics
FINAL EXAM GUIDE
© Portage 2024/2025
,1. Which of the following mechanisms is primarily responsible for
the introduction of new genetic variation within a population?
A) Mutation
B) Non-disjunction
C) Gene flow
D) Genetic drift
Correct Answer: A) Mutation
Rationale: Mutation is the primary source of genetic variation,
introducing new alleles into a population's gene pool, which can
then be acted upon by natural selection.
2. In a dihybrid cross between two heterozygous individuals (AaBb
x AaBb), what is the probability of producing an offspring with the
genotype AaBB?
A) 1/16
B) 1/8
C) 3/16
D) 1/4
Correct Answer: B) 1/8
Rationale: The probability of Aa is 1/2 and the probability of BB
is 1/4. Multiplying these probabilities gives 1/2 1/4 = 1/8.
© Portage 2024/2025
, 3. Which of the following best describes the concept of 'genetic
linkage'?
A) The tendency of alleles that are close together on a
chromosome to be inherited together
B) The random assortment of chromosomes during meiosis
C) The exchange of genetic material between non-sister
chromatids during meiosis
D) The similarity in DNA sequence between two genes
Correct Answer: A) The tendency of alleles that are close
together on a chromosome to be inherited together
Rationale: Genetic linkage refers to the phenomenon where
genes that are close to each other on the same chromosome tend
to be transmitted as a unit, which can affect the inheritance patterns
of certain traits.
4. What is the role of telomerase in eukaryotic cells?
A) To degrade excess RNA molecules
B) To add repetitive nucleotide sequences to the ends of
chromosomes
C) To assist in the folding of proteins
D) To replicate mitochondrial DNA
Correct Answer: B) To add repetitive nucleotide sequences to
the ends of chromosomes
© Portage 2024/2025
Genetics
FINAL EXAM GUIDE
© Portage 2024/2025
,1. Which of the following mechanisms is primarily responsible for
the introduction of new genetic variation within a population?
A) Mutation
B) Non-disjunction
C) Gene flow
D) Genetic drift
Correct Answer: A) Mutation
Rationale: Mutation is the primary source of genetic variation,
introducing new alleles into a population's gene pool, which can
then be acted upon by natural selection.
2. In a dihybrid cross between two heterozygous individuals (AaBb
x AaBb), what is the probability of producing an offspring with the
genotype AaBB?
A) 1/16
B) 1/8
C) 3/16
D) 1/4
Correct Answer: B) 1/8
Rationale: The probability of Aa is 1/2 and the probability of BB
is 1/4. Multiplying these probabilities gives 1/2 1/4 = 1/8.
© Portage 2024/2025
, 3. Which of the following best describes the concept of 'genetic
linkage'?
A) The tendency of alleles that are close together on a
chromosome to be inherited together
B) The random assortment of chromosomes during meiosis
C) The exchange of genetic material between non-sister
chromatids during meiosis
D) The similarity in DNA sequence between two genes
Correct Answer: A) The tendency of alleles that are close
together on a chromosome to be inherited together
Rationale: Genetic linkage refers to the phenomenon where
genes that are close to each other on the same chromosome tend
to be transmitted as a unit, which can affect the inheritance patterns
of certain traits.
4. What is the role of telomerase in eukaryotic cells?
A) To degrade excess RNA molecules
B) To add repetitive nucleotide sequences to the ends of
chromosomes
C) To assist in the folding of proteins
D) To replicate mitochondrial DNA
Correct Answer: B) To add repetitive nucleotide sequences to
the ends of chromosomes
© Portage 2024/2025
