BIOD 210
OBJECTIVE ASSESSMENT - EXAM
BIOD 210 Genetics Final Exam
Questions and Answers
(2026/2027) (Verified Answers)
2026/2027
Genetics | Final Exam | 2026/2027 Edition
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Mendelian Genetics & Inheritance Patterns Transcription, Translation & Gene Regulation
DNA Structure, Replication & Chromosomal Mapping
Chromosomal Aberrations & Genetic Mutations
Bacterial Conjugation, Transformation & Transduction
Oncogenes, Tumor Suppressors & Cancer Therapies
COVER PAGE - 1
, SECTION 1 | Foundations of Genetics & Mendelian Inheritance | Q1-Q15 | BIOD 210 Genetics Final Exam Questions a
Q1 Question 1 of 75
A 28-year-old woman with cystic fibrosis (autosomal recessive) and her partner, who has
no family history of the disorder, are planning to have children. Genetic testing reveals
the woman is homozygous recessive and the partner is a carrier. What is the probability
that each child will be affected by cystic fibrosis?
A. 0%
B. 25%
C. 50%
D. 100%
Correct Answer: C
Rationale:
The woman is homozygous recessive (aa) and the partner is a carrier (Aa). Each child has a 50% chance
of inheriting the recessive allele from both parents (aa = affected) and a 50% chance of being a carrier
(Aa). Option B (25%) would apply only if both parents were carriers.
BIOD 210 Genetics Final Exam Questions and Answers (2026/2027) (Verified Answers) 2026/2027 - 2026/2027 | Passing Score: 80% | Page 2 of {total_pages}
, Q2 Question 2 of 75
In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), where R =
round seed and Y = yellow seed, what is the expected phenotypic ratio in the F2
generation according to Mendel's law of independent assortment?
A. 1:1:1:1
B. 3:1
C. 9:3:3:1
D. 1:2:1
Correct Answer: C
Rationale:
A dihybrid cross of two heterozygotes yields a 9:3:3:1 phenotypic ratio: 9 round/yellow, 3 round/green, 3
wrinkled/yellow, and 1 wrinkled/green. This ratio demonstrates independent assortment of two unlinked
genes. Option A describes a testcross ratio, and B describes a monohybrid ratio.
Q3 Question 3 of 75
A newborn is found to have blood type AB. The mother has blood type A and the father
has blood type B. Which genetic principle best explains why the child expresses both A
and B antigens on red blood cells?
A. Incomplete dominance
B. Codominance
C. Epistasis
D. Polygenic inheritance
Correct Answer: B
Rationale:
The ABO blood group system demonstrates codominance, where both the IA and IB alleles are fully
expressed in the heterozygous state (IAIB = type AB). Incomplete dominance would produce an
intermediate phenotype, while epistasis involves one gene masking another.
BIOD 210 Genetics Final Exam Questions and Answers (2026/2027) (Verified Answers) 2026/2027 - 2026/2027 | Passing Score: 80% | Page 3 of {total_pages}
, Q4 Question 4 of 75
A genetic counselor is evaluating a family pedigree in which an autosomal dominant
disorder appears in every generation and affects males and females equally. Which
additional observation would most strongly support an autosomal dominant rather than
an X-linked dominant inheritance pattern?
A. Affected fathers pass the disorder to all of their daughters
B. Affected fathers pass the disorder to all of their sons
C. The disorder skips a generation
D. Only females are affected in the pedigree
Correct Answer: B
Rationale:
In X-linked dominant inheritance, affected fathers pass the trait to all daughters but no sons. If affected
fathers also pass the disorder to sons, this rules out X-linkage and supports autosomal dominant
inheritance. Option A would actually support X-linked dominant, and C contradicts dominant inheritance.
Q5 Question 5 of 75
In a population of snapdragons, crossing a red-flowered plant with a white-flowered plant
produces offspring with pink flowers. When two pink-flowered plants are crossed, what is
the expected phenotypic ratio of the offspring?
A. 1 red : 2 pink : 1 white
B. 3 red : 1 white
C. 1 red : 1 white
D. All pink
Correct Answer: A
Rationale:
Snapdragon flower color demonstrates incomplete dominance. Pink (RW) x Pink (RW) yields a 1:2:1
genotypic and phenotypic ratio: 1 red (RR), 2 pink (RW), and 1 white (WW). Option B describes a
complete dominance monohybrid cross, and D would result from a pink x white cross.
BIOD 210 Genetics Final Exam Questions and Answers (2026/2027) (Verified Answers) 2026/2027 - 2026/2027 | Passing Score: 80% | Page 4 of {total_pages}
OBJECTIVE ASSESSMENT - EXAM
BIOD 210 Genetics Final Exam
Questions and Answers
(2026/2027) (Verified Answers)
2026/2027
Genetics | Final Exam | 2026/2027 Edition
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Mendelian Genetics & Inheritance Patterns Transcription, Translation & Gene Regulation
DNA Structure, Replication & Chromosomal Mapping
Chromosomal Aberrations & Genetic Mutations
Bacterial Conjugation, Transformation & Transduction
Oncogenes, Tumor Suppressors & Cancer Therapies
COVER PAGE - 1
, SECTION 1 | Foundations of Genetics & Mendelian Inheritance | Q1-Q15 | BIOD 210 Genetics Final Exam Questions a
Q1 Question 1 of 75
A 28-year-old woman with cystic fibrosis (autosomal recessive) and her partner, who has
no family history of the disorder, are planning to have children. Genetic testing reveals
the woman is homozygous recessive and the partner is a carrier. What is the probability
that each child will be affected by cystic fibrosis?
A. 0%
B. 25%
C. 50%
D. 100%
Correct Answer: C
Rationale:
The woman is homozygous recessive (aa) and the partner is a carrier (Aa). Each child has a 50% chance
of inheriting the recessive allele from both parents (aa = affected) and a 50% chance of being a carrier
(Aa). Option B (25%) would apply only if both parents were carriers.
BIOD 210 Genetics Final Exam Questions and Answers (2026/2027) (Verified Answers) 2026/2027 - 2026/2027 | Passing Score: 80% | Page 2 of {total_pages}
, Q2 Question 2 of 75
In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), where R =
round seed and Y = yellow seed, what is the expected phenotypic ratio in the F2
generation according to Mendel's law of independent assortment?
A. 1:1:1:1
B. 3:1
C. 9:3:3:1
D. 1:2:1
Correct Answer: C
Rationale:
A dihybrid cross of two heterozygotes yields a 9:3:3:1 phenotypic ratio: 9 round/yellow, 3 round/green, 3
wrinkled/yellow, and 1 wrinkled/green. This ratio demonstrates independent assortment of two unlinked
genes. Option A describes a testcross ratio, and B describes a monohybrid ratio.
Q3 Question 3 of 75
A newborn is found to have blood type AB. The mother has blood type A and the father
has blood type B. Which genetic principle best explains why the child expresses both A
and B antigens on red blood cells?
A. Incomplete dominance
B. Codominance
C. Epistasis
D. Polygenic inheritance
Correct Answer: B
Rationale:
The ABO blood group system demonstrates codominance, where both the IA and IB alleles are fully
expressed in the heterozygous state (IAIB = type AB). Incomplete dominance would produce an
intermediate phenotype, while epistasis involves one gene masking another.
BIOD 210 Genetics Final Exam Questions and Answers (2026/2027) (Verified Answers) 2026/2027 - 2026/2027 | Passing Score: 80% | Page 3 of {total_pages}
, Q4 Question 4 of 75
A genetic counselor is evaluating a family pedigree in which an autosomal dominant
disorder appears in every generation and affects males and females equally. Which
additional observation would most strongly support an autosomal dominant rather than
an X-linked dominant inheritance pattern?
A. Affected fathers pass the disorder to all of their daughters
B. Affected fathers pass the disorder to all of their sons
C. The disorder skips a generation
D. Only females are affected in the pedigree
Correct Answer: B
Rationale:
In X-linked dominant inheritance, affected fathers pass the trait to all daughters but no sons. If affected
fathers also pass the disorder to sons, this rules out X-linkage and supports autosomal dominant
inheritance. Option A would actually support X-linked dominant, and C contradicts dominant inheritance.
Q5 Question 5 of 75
In a population of snapdragons, crossing a red-flowered plant with a white-flowered plant
produces offspring with pink flowers. When two pink-flowered plants are crossed, what is
the expected phenotypic ratio of the offspring?
A. 1 red : 2 pink : 1 white
B. 3 red : 1 white
C. 1 red : 1 white
D. All pink
Correct Answer: A
Rationale:
Snapdragon flower color demonstrates incomplete dominance. Pink (RW) x Pink (RW) yields a 1:2:1
genotypic and phenotypic ratio: 1 red (RR), 2 pink (RW), and 1 white (WW). Option B describes a
complete dominance monohybrid cross, and D would result from a pink x white cross.
BIOD 210 Genetics Final Exam Questions and Answers (2026/2027) (Verified Answers) 2026/2027 - 2026/2027 | Passing Score: 80% | Page 4 of {total_pages}
