Module 1-7 & Final Exam) For BIOD 210 Genetics
Complete Exam Bundle
Question 1
Which of the following best defines "genetics"?
A) The study of evolution and natural selection
B) The study of heredity and the variation of inherited
characteristics
C) The study of protein synthesis only
D) The study of environmental effects on organisms
Correct Answer: B
Rationale: Genetics is specifically defined as the branch
of biology concerned with the study of heredity, genes,
and genetic variation . While related to evolution, its core
focus is how traits are passed from parents to offspring.
Question 2
A true-breeding purple flower plant is crossed with a
true-breeding white flower plant. All offspring in the F1
1
,generation have purple flowers. This demonstrates:
A) Incomplete dominance
B) Codominance
C) The Law of Segregation
D) The Law of Independent Assortment
Correct Answer: C
Rationale: The Law of Segregation states that alleles
separate during gamete formation. The F1 generation all
show the dominant trait (purple) because they inherited
one dominant and one recessive allele. Independent
assortment deals with multiple genes, not single trait
dominance.
Question 3
If an organism has a genotype of "Aa" for a given gene,
it is considered:
A) Homozygous dominant
B) Homozygous recessive
2
,C) Heterozygous
D) Hemizygous
Correct Answer: C
Rationale: A heterozygous genotype contains two
different alleles for a particular gene (one dominant, one
recessive). Homozygous genotypes have two identical
alleles.
Question 4
Which of the following is an example of a model
organism used in genetics research?
A) Homo sapiens
B) Drosophila melanogaster
C) Escherichia virus T4
D) Arabidopsis thaliana
Correct Answer: B
Rationale: Drosophila melanogaster (fruit fly) is a classic
model organism in genetics due to its short generation
time, large number of offspring, and easily observable
3
, traits . Other common models include mice, worms (C.
elegans), and zebrafish.
Question 5
The observable physical expression of a genotype is
called the:
A) Genome
B) Allele
C) Phenotype
D) Karyotype
Correct Answer: C
Rationale: The phenotype is the set of observable
characteristics or traits of an organism, resulting from the
interaction of its genotype with the environment. The
genotype is the genetic makeup.
Question 6
In a Punnett square for a monohybrid cross between two
heterozygotes (Aa x Aa), what is the probability of
producing a homozygous recessive (aa) offspring?
4
Complete Exam Bundle
Question 1
Which of the following best defines "genetics"?
A) The study of evolution and natural selection
B) The study of heredity and the variation of inherited
characteristics
C) The study of protein synthesis only
D) The study of environmental effects on organisms
Correct Answer: B
Rationale: Genetics is specifically defined as the branch
of biology concerned with the study of heredity, genes,
and genetic variation . While related to evolution, its core
focus is how traits are passed from parents to offspring.
Question 2
A true-breeding purple flower plant is crossed with a
true-breeding white flower plant. All offspring in the F1
1
,generation have purple flowers. This demonstrates:
A) Incomplete dominance
B) Codominance
C) The Law of Segregation
D) The Law of Independent Assortment
Correct Answer: C
Rationale: The Law of Segregation states that alleles
separate during gamete formation. The F1 generation all
show the dominant trait (purple) because they inherited
one dominant and one recessive allele. Independent
assortment deals with multiple genes, not single trait
dominance.
Question 3
If an organism has a genotype of "Aa" for a given gene,
it is considered:
A) Homozygous dominant
B) Homozygous recessive
2
,C) Heterozygous
D) Hemizygous
Correct Answer: C
Rationale: A heterozygous genotype contains two
different alleles for a particular gene (one dominant, one
recessive). Homozygous genotypes have two identical
alleles.
Question 4
Which of the following is an example of a model
organism used in genetics research?
A) Homo sapiens
B) Drosophila melanogaster
C) Escherichia virus T4
D) Arabidopsis thaliana
Correct Answer: B
Rationale: Drosophila melanogaster (fruit fly) is a classic
model organism in genetics due to its short generation
time, large number of offspring, and easily observable
3
, traits . Other common models include mice, worms (C.
elegans), and zebrafish.
Question 5
The observable physical expression of a genotype is
called the:
A) Genome
B) Allele
C) Phenotype
D) Karyotype
Correct Answer: C
Rationale: The phenotype is the set of observable
characteristics or traits of an organism, resulting from the
interaction of its genotype with the environment. The
genotype is the genetic makeup.
Question 6
In a Punnett square for a monohybrid cross between two
heterozygotes (Aa x Aa), what is the probability of
producing a homozygous recessive (aa) offspring?
4
