BIOD 210 MODULE 1-7 EXAM GENETICS – COMPLETE
QUESTION & ANSWER BANK (2026/2027 UPDATE) |
PORTAGE LEARNING | 100% VERIFIED PASS GUIDE
BIOD 210 Genetics Comprehensive Practice Exam (Original)
Questions 1–80
Table of Contents
1. Introduction
2. Section I: Foundations of Genetics
3. Section II: DNA Structure and Function
4. Section III: Chromosomes and Cell Division
5. Answer Key with Rationales
Section I: Foundations of Genetics
Multiple-Choice Questions
1. Which scientist is known for establishing the basic principles of inheritance through
experiments with pea plants?
A. Charles Darwin
B. Gregor Mendel
C. James Watson
D. Frederick Griffith
Answer: B. Gregor Mendel
Rationale: Gregor Mendel studied pea plant traits and developed the foundational laws of
inheritance, including segregation and independent assortment.
2. The basic unit of heredity is called a:
A. Chromosome
B. Protein
C. Gene
D. Nucleotide
,Answer: C. Gene
Rationale: A gene is a segment of DNA that contains instructions for producing a functional
product, such as a protein or RNA molecule.
3. An organism’s observable characteristics are referred to as its:
A. Genotype
B. Phenotype
C. Allele
D. Genome
Answer: B. Phenotype
Rationale: Phenotype describes observable traits, while genotype refers to the genetic makeup
responsible for those traits.
4. Different versions of the same gene are called:
A. Chromatids
B. Alleles
C. Nucleotides
D. Codons
Answer: B. Alleles
Rationale: Alleles are alternative forms of a gene that may produce different versions of a trait.
5. A person with two identical alleles for a particular gene is described as:
A. Heterozygous
B. Homozygous
C. Dominant
D. Recessive
Answer: B. Homozygous
Rationale: Homozygous individuals possess two identical alleles, while heterozygous
individuals have two different alleles.
6. Which molecule stores genetic information in most living organisms?
, A. RNA
B. ATP
C. DNA
D. Protein
Answer: C. DNA
Rationale: DNA stores hereditary information that is passed from one generation to the next.
7. Which nitrogenous base is found in DNA but not RNA?
A. Uracil
B. Adenine
C. Thymine
D. Guanine
Answer: C. Thymine
Rationale: DNA contains thymine, whereas RNA contains uracil instead.
8. The structure of DNA is commonly described as a:
A. Single-stranded chain
B. Double helix
C. Protein coil
D. Circular chromosome only
Answer: B. Double helix
Rationale: DNA consists of two complementary strands twisted into a double helix structure.
9. Which scientist contributed to the discovery of the DNA double-helix structure?
A. Watson and Crick
B. Mendel and Darwin
C. Franklin and Griffith
D. Morgan and Avery
Answer: A. Watson and Crick
Rationale: James Watson and Francis Crick proposed the double-helix model using evidence
including Rosalind Franklin’s DNA imaging data.
QUESTION & ANSWER BANK (2026/2027 UPDATE) |
PORTAGE LEARNING | 100% VERIFIED PASS GUIDE
BIOD 210 Genetics Comprehensive Practice Exam (Original)
Questions 1–80
Table of Contents
1. Introduction
2. Section I: Foundations of Genetics
3. Section II: DNA Structure and Function
4. Section III: Chromosomes and Cell Division
5. Answer Key with Rationales
Section I: Foundations of Genetics
Multiple-Choice Questions
1. Which scientist is known for establishing the basic principles of inheritance through
experiments with pea plants?
A. Charles Darwin
B. Gregor Mendel
C. James Watson
D. Frederick Griffith
Answer: B. Gregor Mendel
Rationale: Gregor Mendel studied pea plant traits and developed the foundational laws of
inheritance, including segregation and independent assortment.
2. The basic unit of heredity is called a:
A. Chromosome
B. Protein
C. Gene
D. Nucleotide
,Answer: C. Gene
Rationale: A gene is a segment of DNA that contains instructions for producing a functional
product, such as a protein or RNA molecule.
3. An organism’s observable characteristics are referred to as its:
A. Genotype
B. Phenotype
C. Allele
D. Genome
Answer: B. Phenotype
Rationale: Phenotype describes observable traits, while genotype refers to the genetic makeup
responsible for those traits.
4. Different versions of the same gene are called:
A. Chromatids
B. Alleles
C. Nucleotides
D. Codons
Answer: B. Alleles
Rationale: Alleles are alternative forms of a gene that may produce different versions of a trait.
5. A person with two identical alleles for a particular gene is described as:
A. Heterozygous
B. Homozygous
C. Dominant
D. Recessive
Answer: B. Homozygous
Rationale: Homozygous individuals possess two identical alleles, while heterozygous
individuals have two different alleles.
6. Which molecule stores genetic information in most living organisms?
, A. RNA
B. ATP
C. DNA
D. Protein
Answer: C. DNA
Rationale: DNA stores hereditary information that is passed from one generation to the next.
7. Which nitrogenous base is found in DNA but not RNA?
A. Uracil
B. Adenine
C. Thymine
D. Guanine
Answer: C. Thymine
Rationale: DNA contains thymine, whereas RNA contains uracil instead.
8. The structure of DNA is commonly described as a:
A. Single-stranded chain
B. Double helix
C. Protein coil
D. Circular chromosome only
Answer: B. Double helix
Rationale: DNA consists of two complementary strands twisted into a double helix structure.
9. Which scientist contributed to the discovery of the DNA double-helix structure?
A. Watson and Crick
B. Mendel and Darwin
C. Franklin and Griffith
D. Morgan and Avery
Answer: A. Watson and Crick
Rationale: James Watson and Francis Crick proposed the double-helix model using evidence
including Rosalind Franklin’s DNA imaging data.
