Genetics and Genomics Complete Exam Bank With
2026 High Yield Questions and Detailed Rationales
for Medical and Graduate Students
Exam Overview
This comprehensive practice examination contains 300 questions
covering genetics and genomics. The content is divided into five major
sections: Mendelian Genetics and Inheritance Patterns, Chromosomal
Genetics and Disorders, Molecular Genetics and Gene Regulation,
Population Genetics and Evolution, and Genomics and Precision
Medicine. Each question is followed by a detailed rationale explaining
the correct answer and why the distractors are incorrect. This exam is
designed to prepare students for genetics coursework and clinical
application.
Section One: Mendelian Genetics and Inheritance Patterns Questions 1
through 60
Question 1
Mendelian genetics is based on the study of:
A) Inheritance of traits in pea plants
B) Inheritance of traits in fruit flies
C) Inheritance of traits in humans
D) Inheritance of traits in bacteria
Answer: A
Explanation: Mendelian genetics is based on the study of inheritance of
traits in pea plants by Gregor Mendel. He discovered the fundamental laws
of inheritance, including the law of segregation and the law of independent
assortment. His work laid the foundation for modern genetics.
,
Question 2
The law of segregation states that:
A) Alleles for a trait separate during gamete formation
B) Alleles for different traits segregate independently
C) Dominant alleles mask recessive alleles
D) Traits are inherited from both parents
Answer: A
Explanation: The law of segregation states that alleles for a trait separate
during gamete formation. Each gamete receives only one allele for each
gene. This ensures that offspring inherit one allele from each parent.
Question 3
The law of independent assortment states that:
A) Alleles for different traits segregate independently
B) Alleles for a trait separate during gamete formation
C) Dominant alleles mask recessive alleles
D) Traits are inherited from both parents
Answer: A
Explanation: The law of independent assortment states that alleles for
different traits segregate independently of each other. This applies to genes
on different chromosomes. It contributes to genetic diversity.
Question 4
A dominant allele is one that:
A) Is expressed in the phenotype when present
B) Is masked by a recessive allele
C) Is only expressed in the homozygous state
D) Is not expressed in the phenotype
Answer: A
Explanation: A dominant allele is one that is expressed in the phenotype
when present. It masks the expression of the recessive allele. A dominant
allele only needs to be present in one copy to be expressed.
,
Question 5
A recessive allele is one that:
A) Is expressed only in the homozygous state
B) Is expressed in the phenotype when present
C) Masks the expression of the dominant allele
D) Is always expressed in the phenotype
Answer: A
Explanation: A recessive allele is one that is expressed only in the
homozygous state. It is masked by the presence of a dominant allele.
Recessive traits appear when both alleles are recessive.
Question 6
A genotype is:
A) The genetic makeup of an organism
B) The physical appearance of an organism
C) The environment of an organism
D) The phenotype of an organism
Answer: A
Explanation: A genotype is the genetic makeup of an organism. It consists of
the alleles present at a particular gene locus. The genotype determines the
phenotype.
Question 7
A phenotype is:
A) The physical appearance of an organism
B) The genetic makeup of an organism
C) The environment of an organism
D) The genotype of an organism
Answer: A
Explanation: A phenotype is the physical appearance of an organism. It is
determined by the genotype and environmental factors. The phenotype
includes traits such as eye color and height.
,
Question 8
Homozygous means:
A) Having two identical alleles for a gene
B) Having two different alleles for a gene
C) Having one allele for a gene
D) Having no alleles for a gene
Answer: A
Explanation: Homozygous means having two identical alleles for a gene. An
organism can be homozygous dominant or homozygous recessive.
Heterozygous means having two different alleles.
Question 9
Heterozygous means:
A) Having two different alleles for a gene
B) Having two identical alleles for a gene
C) Having one allele for a gene
D) Having no alleles for a gene
Answer: A
Explanation: Heterozygous means having two different alleles for a gene.
One allele is dominant and the other is recessive. The dominant allele is
expressed in the phenotype.
Question 10
A Punnett square is used to:
A) Predict the outcome of a genetic cross
B) Determine the genotype of an organism
C) Determine the phenotype of an organism
D) Identify mutations
Answer: A
Explanation: A Punnett square is used to predict the outcome of a genetic
cross. It shows the possible combinations of alleles in offspring. It is based
on the laws of segregation and independent assortment.
2026 High Yield Questions and Detailed Rationales
for Medical and Graduate Students
Exam Overview
This comprehensive practice examination contains 300 questions
covering genetics and genomics. The content is divided into five major
sections: Mendelian Genetics and Inheritance Patterns, Chromosomal
Genetics and Disorders, Molecular Genetics and Gene Regulation,
Population Genetics and Evolution, and Genomics and Precision
Medicine. Each question is followed by a detailed rationale explaining
the correct answer and why the distractors are incorrect. This exam is
designed to prepare students for genetics coursework and clinical
application.
Section One: Mendelian Genetics and Inheritance Patterns Questions 1
through 60
Question 1
Mendelian genetics is based on the study of:
A) Inheritance of traits in pea plants
B) Inheritance of traits in fruit flies
C) Inheritance of traits in humans
D) Inheritance of traits in bacteria
Answer: A
Explanation: Mendelian genetics is based on the study of inheritance of
traits in pea plants by Gregor Mendel. He discovered the fundamental laws
of inheritance, including the law of segregation and the law of independent
assortment. His work laid the foundation for modern genetics.
,
Question 2
The law of segregation states that:
A) Alleles for a trait separate during gamete formation
B) Alleles for different traits segregate independently
C) Dominant alleles mask recessive alleles
D) Traits are inherited from both parents
Answer: A
Explanation: The law of segregation states that alleles for a trait separate
during gamete formation. Each gamete receives only one allele for each
gene. This ensures that offspring inherit one allele from each parent.
Question 3
The law of independent assortment states that:
A) Alleles for different traits segregate independently
B) Alleles for a trait separate during gamete formation
C) Dominant alleles mask recessive alleles
D) Traits are inherited from both parents
Answer: A
Explanation: The law of independent assortment states that alleles for
different traits segregate independently of each other. This applies to genes
on different chromosomes. It contributes to genetic diversity.
Question 4
A dominant allele is one that:
A) Is expressed in the phenotype when present
B) Is masked by a recessive allele
C) Is only expressed in the homozygous state
D) Is not expressed in the phenotype
Answer: A
Explanation: A dominant allele is one that is expressed in the phenotype
when present. It masks the expression of the recessive allele. A dominant
allele only needs to be present in one copy to be expressed.
,
Question 5
A recessive allele is one that:
A) Is expressed only in the homozygous state
B) Is expressed in the phenotype when present
C) Masks the expression of the dominant allele
D) Is always expressed in the phenotype
Answer: A
Explanation: A recessive allele is one that is expressed only in the
homozygous state. It is masked by the presence of a dominant allele.
Recessive traits appear when both alleles are recessive.
Question 6
A genotype is:
A) The genetic makeup of an organism
B) The physical appearance of an organism
C) The environment of an organism
D) The phenotype of an organism
Answer: A
Explanation: A genotype is the genetic makeup of an organism. It consists of
the alleles present at a particular gene locus. The genotype determines the
phenotype.
Question 7
A phenotype is:
A) The physical appearance of an organism
B) The genetic makeup of an organism
C) The environment of an organism
D) The genotype of an organism
Answer: A
Explanation: A phenotype is the physical appearance of an organism. It is
determined by the genotype and environmental factors. The phenotype
includes traits such as eye color and height.
,
Question 8
Homozygous means:
A) Having two identical alleles for a gene
B) Having two different alleles for a gene
C) Having one allele for a gene
D) Having no alleles for a gene
Answer: A
Explanation: Homozygous means having two identical alleles for a gene. An
organism can be homozygous dominant or homozygous recessive.
Heterozygous means having two different alleles.
Question 9
Heterozygous means:
A) Having two different alleles for a gene
B) Having two identical alleles for a gene
C) Having one allele for a gene
D) Having no alleles for a gene
Answer: A
Explanation: Heterozygous means having two different alleles for a gene.
One allele is dominant and the other is recessive. The dominant allele is
expressed in the phenotype.
Question 10
A Punnett square is used to:
A) Predict the outcome of a genetic cross
B) Determine the genotype of an organism
C) Determine the phenotype of an organism
D) Identify mutations
Answer: A
Explanation: A Punnett square is used to predict the outcome of a genetic
cross. It shows the possible combinations of alleles in offspring. It is based
on the laws of segregation and independent assortment.
