University of California, San
6M · 012 DOIB
Diego
★ ★
UCSD
Division of Biological Sciences
EST. 1960
F I AT L U X · L E T T H E R E B E L I G H T
BIOD 210 — Module 6 Examination
G E N E T I CS · CO M P R E H E N S I V E R E V I E W
INSTITUTION University of California, San Diego COURSE CODE BIOD 210
PROGRAM Biological Sciences — ACADEMIC YEAR
Undergraduate
EXAM TITLE Module 6 Exam — Genetics TOTAL QUESTIONS 134 Questions
COURSE TITLE Genetics and Molecular Biology FORMAT Multiple Choice — Select the
Single Best Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question.
▸ All questions are based on Module 6 genetics content.
▸ Topics include Darwinian evolution, inheritance, molecular genetics, and gene regulation.
▸ Correct answers and detailed rationales appear below each question.
▸ Read each question carefully before selecting your answer.
, MODULE 6 — GENETICS: EVOLUTION, INHERITANCE &
Questions 1 – 134
MOLECULAR BIOLOGY
1. According to Darwin's theory of natural selection, which of the following best describes
the outcome of adaptation to harsh environments?
A. All organisms will survive regardless of adaptation
B. Only organisms that adapt to harsh environments will survive
C. Organisms that adapt will reproduce more slowly
D. Adaptation has no effect on survival
CORRECT ANSWER B — Only organisms that adapt to harsh environments will survive
RATIONALE Darwin's theory of natural selection states that organisms with traits better suited
to their environment are more likely to survive and reproduce. In harsh
environments, adaptation is critical for survival, as non-adapted individuals are
less likely to pass on their genes.
2. Which animal model is described as being able to be 'humanized' for research purposes?
A. Fruit fly (Drosophila melanogaster)
B. Zebrafish (Danio rerio)
C. Mice (Mus musculus)
D. Worms (Caenorhabditis elegans)
CORRECT ANSWER C — Mice (Mus musculus)
RATIONALE Mice are the most commonly used mammalian model organism in biomedical
research. They can be 'humanized' through genetic engineering, where human
genes or cells are introduced into the mouse genome to study human diseases
and test potential therapies.
,3. What is a key advantage of using fruit flies (Drosophila) as a model organism in genetics
research?
A. They have a complex nervous system similar to humans
B. They are extremely inexpensive with an extremely short life span
C. They have transparent eggs and embryos
D. They can be humanized for research
CORRECT ANSWER B — They are extremely inexpensive with an extremely short life span
RATIONALE Drosophila melanogaster is a powerful genetic model organism due to its low
cost, rapid generation time (~10 days), and ease of maintenance. These features
enable large-scale genetic screens and the observation of multiple generations in
a short period.
4. Which animal model is characterized by having a transparent egg and embryo, making it
ideal for developmental biology studies?
A. Fruit fly (Drosophila melanogaster)
B. Zebrafish (Danio rerio)
C. Mice (Mus musculus)
D. Worms (Caenorhabditis elegans)
CORRECT ANSWER B — Zebrafish (Danio rerio)
RATIONALE Zebrafish embryos and eggs are transparent, allowing researchers to directly
observe developmental processes in vivo. This characteristic makes zebrafish an
excellent model for studying vertebrate development, organogenesis, and genetic
mutations affecting embryonic development.
, 5. Which animal model is described as having a simple, easy-to-research nervous system?
A. Fruit fly (Drosophila melanogaster)
B. Zebrafish (Danio rerio)
C. Mice (Mus musculus)
D. Worms (Caenorhabditis elegans)
CORRECT ANSWER D — Worms (Caenorhabditis elegans)
RATIONALE C. elegans has a simple, well-mapped nervous system consisting of exactly 302
neurons in the adult hermaphrodite. This simplicity, combined with its
transparency and genetic tractability, makes it an invaluable model for studying
neurobiology, neural development, and behavior.
6. What is the preformation theory in the context of early genetics and embryology?
A. Organisms develop step-by-step from a fertilized egg
B. Organisms grow from a tiny pre-formed human called a homunculus
C. Living things can arise from nonliving matter
D. Genes are carried on chromosomes
CORRECT ANSWER B — Organisms grow from a tiny pre-formed human called a homunculus
RATIONALE Preformation theory was a historical belief that organisms develop from
miniature, fully formed versions of themselves. The homunculus was the
imagined pre-formed human within the sperm or egg, which would simply grow
larger during development. This theory was eventually disproven by epigenesis.
6M · 012 DOIB
Diego
★ ★
UCSD
Division of Biological Sciences
EST. 1960
F I AT L U X · L E T T H E R E B E L I G H T
BIOD 210 — Module 6 Examination
G E N E T I CS · CO M P R E H E N S I V E R E V I E W
INSTITUTION University of California, San Diego COURSE CODE BIOD 210
PROGRAM Biological Sciences — ACADEMIC YEAR
Undergraduate
EXAM TITLE Module 6 Exam — Genetics TOTAL QUESTIONS 134 Questions
COURSE TITLE Genetics and Molecular Biology FORMAT Multiple Choice — Select the
Single Best Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question.
▸ All questions are based on Module 6 genetics content.
▸ Topics include Darwinian evolution, inheritance, molecular genetics, and gene regulation.
▸ Correct answers and detailed rationales appear below each question.
▸ Read each question carefully before selecting your answer.
, MODULE 6 — GENETICS: EVOLUTION, INHERITANCE &
Questions 1 – 134
MOLECULAR BIOLOGY
1. According to Darwin's theory of natural selection, which of the following best describes
the outcome of adaptation to harsh environments?
A. All organisms will survive regardless of adaptation
B. Only organisms that adapt to harsh environments will survive
C. Organisms that adapt will reproduce more slowly
D. Adaptation has no effect on survival
CORRECT ANSWER B — Only organisms that adapt to harsh environments will survive
RATIONALE Darwin's theory of natural selection states that organisms with traits better suited
to their environment are more likely to survive and reproduce. In harsh
environments, adaptation is critical for survival, as non-adapted individuals are
less likely to pass on their genes.
2. Which animal model is described as being able to be 'humanized' for research purposes?
A. Fruit fly (Drosophila melanogaster)
B. Zebrafish (Danio rerio)
C. Mice (Mus musculus)
D. Worms (Caenorhabditis elegans)
CORRECT ANSWER C — Mice (Mus musculus)
RATIONALE Mice are the most commonly used mammalian model organism in biomedical
research. They can be 'humanized' through genetic engineering, where human
genes or cells are introduced into the mouse genome to study human diseases
and test potential therapies.
,3. What is a key advantage of using fruit flies (Drosophila) as a model organism in genetics
research?
A. They have a complex nervous system similar to humans
B. They are extremely inexpensive with an extremely short life span
C. They have transparent eggs and embryos
D. They can be humanized for research
CORRECT ANSWER B — They are extremely inexpensive with an extremely short life span
RATIONALE Drosophila melanogaster is a powerful genetic model organism due to its low
cost, rapid generation time (~10 days), and ease of maintenance. These features
enable large-scale genetic screens and the observation of multiple generations in
a short period.
4. Which animal model is characterized by having a transparent egg and embryo, making it
ideal for developmental biology studies?
A. Fruit fly (Drosophila melanogaster)
B. Zebrafish (Danio rerio)
C. Mice (Mus musculus)
D. Worms (Caenorhabditis elegans)
CORRECT ANSWER B — Zebrafish (Danio rerio)
RATIONALE Zebrafish embryos and eggs are transparent, allowing researchers to directly
observe developmental processes in vivo. This characteristic makes zebrafish an
excellent model for studying vertebrate development, organogenesis, and genetic
mutations affecting embryonic development.
, 5. Which animal model is described as having a simple, easy-to-research nervous system?
A. Fruit fly (Drosophila melanogaster)
B. Zebrafish (Danio rerio)
C. Mice (Mus musculus)
D. Worms (Caenorhabditis elegans)
CORRECT ANSWER D — Worms (Caenorhabditis elegans)
RATIONALE C. elegans has a simple, well-mapped nervous system consisting of exactly 302
neurons in the adult hermaphrodite. This simplicity, combined with its
transparency and genetic tractability, makes it an invaluable model for studying
neurobiology, neural development, and behavior.
6. What is the preformation theory in the context of early genetics and embryology?
A. Organisms develop step-by-step from a fertilized egg
B. Organisms grow from a tiny pre-formed human called a homunculus
C. Living things can arise from nonliving matter
D. Genes are carried on chromosomes
CORRECT ANSWER B — Organisms grow from a tiny pre-formed human called a homunculus
RATIONALE Preformation theory was a historical belief that organisms develop from
miniature, fully formed versions of themselves. The homunculus was the
imagined pre-formed human within the sperm or egg, which would simply grow
larger during development. This theory was eventually disproven by epigenesis.
