BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
BIOD 210 Module 6
Genetics
Questions & Answers | Grade A | 100% Correct
Latest Update
Portage Learning | Health Sciences & Genetics Education
Genetics Module 6 Examination Preparation
Total Questions 110 Multiple-Choice Items
Sections 8 topical sections
Cognitive Distribution 30% Recall | 50% Application | 20% Analysis
Item Style 65% Application-Based | 35% Direct Recall
Format 4 options (A-D), single best answer, with rationale
Audience Portage Learning BIOD 210 Genetics Module 6 students
Alignment 2026/2027 genetics curriculum standards
Coverage Developmental genetics, cancer genetics, hereditary cancer syndromes, pharmaco
Instructions: This Grade A test bank assesses mastery of BIOD 210 Genetics Module 6
content including developmental genetics and gene expression in development, cancer
genetics and molecular oncology, hereditary cancer syndromes and genetic risk,
pharmacogenomics and personalized medicine, immunogenetics and the MHC system,
genetic basis of complex disease, human behavioral and neurogenetics, and genetic
counseling and precision medicine. Each item presents one best answer; rationales
explain the correct choice and why distractors fail, with reference to specific genes,
syndromes, or pathways each distractor misrepresents.
Page 1
,BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
Section 1: Developmental Genetics and Gene Expression in
Development (Differential Gene Expression, Morphogens, Homeotic
Genes, & Body Axis Formation) [Q1-Q15]
Q1: A developmental biologist is studying cells that have the same genome but express
different genes during development. This phenomenon is best described as:
A. Gene amplification
B. Differential gene expression [CORRECT]
C. Chromosomal rearrangement
D. Genomic imprinting
Correct Answer: B
Rationale: Differential gene expression refers to cells with identical genomes expressing
different subsets of genes during development, which is the basis for cellular differentiation.
Gene amplification increases copy number of specific genes, chromosomal rearrangement
alters gene order, and genomic imprinting is parent-of-origin-specific expression. Only
differential gene expression fits the described phenomenon.
Q2: A morphogen is best described as a signaling molecule that:
A. Is expressed uniformly throughout the embryo
B. Elicits different cellular responses at different concentrations through a
concentration gradient [CORRECT]
C. Acts only at immediate cell-cell contact
D. Is responsible for apoptosis in development
Correct Answer: B
Rationale: A morphogen is a diffusible signaling molecule that forms a concentration gradient
and elicits different cellular responses at different concentrations, providing positional
information. Uniform expression, contact-dependent only, and apoptosis-related descriptions
do not fit the morphogen concept. Morphogens include Sonic hedgehog, BMP, and Wnt.
Q3: A researcher studies Hox genes in Drosophila development. Hox genes are best
described as:
A. Genes that encode metabolic enzymes
B. Homeotic genes that specify segment identity along the anterior-posterior body
axis [CORRECT]
C. Genes that encode ribosomal RNA
D. Genes that control mitochondrial division
Correct Answer: B
Rationale: Hox genes are homeotic genes that encode transcription factors specifying segment
identity along the anterior-posterior body axis; their mutation can transform one body segment
into another. They are not metabolic enzymes, ribosomal RNA, or mitochondrial genes. Hox
genes are highly conserved across animals.
Page 2
,BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
Q4: The arrangement of Hox genes on the chromosome correlates with their expression
along the anterior-posterior body axis. This property is best described as:
A. Collinearity [CORRECT]
B. Codominance
C. Epistasis
D. Pleiotropy
Correct Answer: A
Rationale: Collinearity refers to the spatial and temporal correspondence between the order of
Hox genes on the chromosome and their expression domains along the anterior-posterior body
axis. Codominance, epistasis, and pleiotropy describe different genetic principles not specific
to Hox gene organization.
Q5: Which of the following best describes "determination" in developmental biology?
A. The visible differentiation of a cell into a specialized type
B. The commitment of a cell to a particular fate before visible differentiation occurs
[CORRECT]
C. The process of cell division during development
D. The programmed death of cells during development
Correct Answer: B
Rationale: Determination is the commitment of a cell to a particular fate before visible
differentiation occurs, marking a stable change in the cell's developmental potential. Visible
differentiation is the subsequent process, cell division is proliferation, and programmed death
is apoptosis. Determination precedes differentiation.
Q6: A pluripotent stem cell is best described as a cell that can:
A. Differentiate into all cell types including extraembryonic tissues
B. Differentiate into all three germ layers but not extraembryonic tissues [CORRECT]
C. Differentiate into only one cell type
D. Cannot differentiate at all
Correct Answer: B
Rationale: Pluripotent stem cells differentiate into all three germ layers (ectoderm, mesoderm,
endoderm) but not extraembryonic tissues; this distinguishes them from totipotent (all cell
types including extraembryonic) cells. Unipotent cells differentiate into one type only, and
nullipotent cells cannot differentiate. Pluripotency is characteristic of embryonic stem cells.
Page 3
, BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
Q7: A totipotent cell is best described as a cell that can:
A. Differentiate into all cell types including extraembryonic tissues [CORRECT]
B. Differentiate into all three germ layers but not extraembryonic tissues
C. Differentiate into only one cell type
D. Cannot differentiate at all
Correct Answer: A
Rationale: A totipotent cell can differentiate into all cell types including extraembryonic
tissues, as in the zygote and early blastomeres. Pluripotent cells cannot form extraembryonic
tissues; unipotent cells form one cell type only; nullipotent cells cannot differentiate.
Totipotency is the broadest developmental potential.
Q8: A researcher observes that Sonic hedgehog (Shh) is expressed in the zone of polarizing
activity (ZPA) in the developing limb bud. Shh is best classified as a:
A. Morphogen [CORRECT]
B. Homeotic gene
C. Tumor suppressor
D. Apoptotic regulator
Correct Answer: A
Rationale: Sonic hedgehog (Shh) is a morphogen that forms a concentration gradient
specifying digit identity in the developing limb bud; high concentrations specify posterior
digits, and low concentrations specify anterior digits. Shh is not a homeotic gene (it regulates
Hox expression), tumor suppressor, or direct apoptotic regulator.
Q9: In C. elegans development, programmed cell death is a normal part of development.
The gene ced-9 functions as:
A. A pro-apoptotic gene
B. An anti-apoptotic gene that inhibits cell death [CORRECT]
C. A morphogen
D. A homeotic gene
Correct Answer: B
Rationale: In C. elegans, ced-9 encodes an anti-apoptotic protein homologous to mammalian
Bcl-2, which inhibits cell death by preventing ced-3 (caspase) activation. The pro-apoptotic
genes in C. elegans are ced-3 and ced-4 (egl-1). Ced-9 is not a morphogen or homeotic gene; it
directly regulates apoptosis during development.
Page 4
BIOD 210 Module 6
Genetics
Questions & Answers | Grade A | 100% Correct
Latest Update
Portage Learning | Health Sciences & Genetics Education
Genetics Module 6 Examination Preparation
Total Questions 110 Multiple-Choice Items
Sections 8 topical sections
Cognitive Distribution 30% Recall | 50% Application | 20% Analysis
Item Style 65% Application-Based | 35% Direct Recall
Format 4 options (A-D), single best answer, with rationale
Audience Portage Learning BIOD 210 Genetics Module 6 students
Alignment 2026/2027 genetics curriculum standards
Coverage Developmental genetics, cancer genetics, hereditary cancer syndromes, pharmaco
Instructions: This Grade A test bank assesses mastery of BIOD 210 Genetics Module 6
content including developmental genetics and gene expression in development, cancer
genetics and molecular oncology, hereditary cancer syndromes and genetic risk,
pharmacogenomics and personalized medicine, immunogenetics and the MHC system,
genetic basis of complex disease, human behavioral and neurogenetics, and genetic
counseling and precision medicine. Each item presents one best answer; rationales
explain the correct choice and why distractors fail, with reference to specific genes,
syndromes, or pathways each distractor misrepresents.
Page 1
,BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
Section 1: Developmental Genetics and Gene Expression in
Development (Differential Gene Expression, Morphogens, Homeotic
Genes, & Body Axis Formation) [Q1-Q15]
Q1: A developmental biologist is studying cells that have the same genome but express
different genes during development. This phenomenon is best described as:
A. Gene amplification
B. Differential gene expression [CORRECT]
C. Chromosomal rearrangement
D. Genomic imprinting
Correct Answer: B
Rationale: Differential gene expression refers to cells with identical genomes expressing
different subsets of genes during development, which is the basis for cellular differentiation.
Gene amplification increases copy number of specific genes, chromosomal rearrangement
alters gene order, and genomic imprinting is parent-of-origin-specific expression. Only
differential gene expression fits the described phenomenon.
Q2: A morphogen is best described as a signaling molecule that:
A. Is expressed uniformly throughout the embryo
B. Elicits different cellular responses at different concentrations through a
concentration gradient [CORRECT]
C. Acts only at immediate cell-cell contact
D. Is responsible for apoptosis in development
Correct Answer: B
Rationale: A morphogen is a diffusible signaling molecule that forms a concentration gradient
and elicits different cellular responses at different concentrations, providing positional
information. Uniform expression, contact-dependent only, and apoptosis-related descriptions
do not fit the morphogen concept. Morphogens include Sonic hedgehog, BMP, and Wnt.
Q3: A researcher studies Hox genes in Drosophila development. Hox genes are best
described as:
A. Genes that encode metabolic enzymes
B. Homeotic genes that specify segment identity along the anterior-posterior body
axis [CORRECT]
C. Genes that encode ribosomal RNA
D. Genes that control mitochondrial division
Correct Answer: B
Rationale: Hox genes are homeotic genes that encode transcription factors specifying segment
identity along the anterior-posterior body axis; their mutation can transform one body segment
into another. They are not metabolic enzymes, ribosomal RNA, or mitochondrial genes. Hox
genes are highly conserved across animals.
Page 2
,BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
Q4: The arrangement of Hox genes on the chromosome correlates with their expression
along the anterior-posterior body axis. This property is best described as:
A. Collinearity [CORRECT]
B. Codominance
C. Epistasis
D. Pleiotropy
Correct Answer: A
Rationale: Collinearity refers to the spatial and temporal correspondence between the order of
Hox genes on the chromosome and their expression domains along the anterior-posterior body
axis. Codominance, epistasis, and pleiotropy describe different genetic principles not specific
to Hox gene organization.
Q5: Which of the following best describes "determination" in developmental biology?
A. The visible differentiation of a cell into a specialized type
B. The commitment of a cell to a particular fate before visible differentiation occurs
[CORRECT]
C. The process of cell division during development
D. The programmed death of cells during development
Correct Answer: B
Rationale: Determination is the commitment of a cell to a particular fate before visible
differentiation occurs, marking a stable change in the cell's developmental potential. Visible
differentiation is the subsequent process, cell division is proliferation, and programmed death
is apoptosis. Determination precedes differentiation.
Q6: A pluripotent stem cell is best described as a cell that can:
A. Differentiate into all cell types including extraembryonic tissues
B. Differentiate into all three germ layers but not extraembryonic tissues [CORRECT]
C. Differentiate into only one cell type
D. Cannot differentiate at all
Correct Answer: B
Rationale: Pluripotent stem cells differentiate into all three germ layers (ectoderm, mesoderm,
endoderm) but not extraembryonic tissues; this distinguishes them from totipotent (all cell
types including extraembryonic) cells. Unipotent cells differentiate into one type only, and
nullipotent cells cannot differentiate. Pluripotency is characteristic of embryonic stem cells.
Page 3
, BIOD 210 Module 6 Genetics - Questions & Answers - Grade A Portage Learning
Q7: A totipotent cell is best described as a cell that can:
A. Differentiate into all cell types including extraembryonic tissues [CORRECT]
B. Differentiate into all three germ layers but not extraembryonic tissues
C. Differentiate into only one cell type
D. Cannot differentiate at all
Correct Answer: A
Rationale: A totipotent cell can differentiate into all cell types including extraembryonic
tissues, as in the zygote and early blastomeres. Pluripotent cells cannot form extraembryonic
tissues; unipotent cells form one cell type only; nullipotent cells cannot differentiate.
Totipotency is the broadest developmental potential.
Q8: A researcher observes that Sonic hedgehog (Shh) is expressed in the zone of polarizing
activity (ZPA) in the developing limb bud. Shh is best classified as a:
A. Morphogen [CORRECT]
B. Homeotic gene
C. Tumor suppressor
D. Apoptotic regulator
Correct Answer: A
Rationale: Sonic hedgehog (Shh) is a morphogen that forms a concentration gradient
specifying digit identity in the developing limb bud; high concentrations specify posterior
digits, and low concentrations specify anterior digits. Shh is not a homeotic gene (it regulates
Hox expression), tumor suppressor, or direct apoptotic regulator.
Q9: In C. elegans development, programmed cell death is a normal part of development.
The gene ced-9 functions as:
A. A pro-apoptotic gene
B. An anti-apoptotic gene that inhibits cell death [CORRECT]
C. A morphogen
D. A homeotic gene
Correct Answer: B
Rationale: In C. elegans, ced-9 encodes an anti-apoptotic protein homologous to mammalian
Bcl-2, which inhibits cell death by preventing ced-3 (caspase) activation. The pro-apoptotic
genes in C. elegans are ced-3 and ced-4 (egl-1). Ced-9 is not a morphogen or homeotic gene; it
directly regulates apoptosis during development.
Page 4
