ESTUDYR
WGU BIO C190 UNIT 6 | MULTICHOICE ANSWERED EXAM QUESTIONS
WITH DETAILED RATIONALES | 2026
1. Which structure contains the largest amount of genetic information?
A. Gene
B. Allele
C. Protein
D. ⭐Correct Answer: D – Chromosome⭐
Rationale: A chromosome is a long DNA molecule housing many genes and alleles; genes
and alleles are smaller units on chromosomes.
2. Fur color in dogs is an example of a(n):
A. Genotype
B. Allele
C. ⭐Correct Answer: C – Phenotype⭐
D. Chromosome
Rationale: Phenotype = observable trait (fur color); genotype is genetic makeup causing
the trait.
3. The genes that encode brown pigment in a dog are part of the dog's:
A. Phenotype
B. Allele
C. ⭐Correct Answer: C – Genotype⭐
D. Chromosome number
Rationale: Genotype describes the organism’s specific alleles (genes) that determine
traits.
4. A cell having two different alleles of the same gene is called:
A. Homozygous
B. Haploid
C. ⭐Correct Answer: C – Heterozygous⭐
D. Polyploid
Rationale: Heterozygous = two different alleles (e.g., Aa) at a locus.
5. Prior to meiosis, which event happens during interphase?
A. The cell divides
B. The nucleus breaks down
C. ⭐Correct Answer: C – DNA is copied (S phase)⭐
D. Chromosomes separate
, ESTUDYR
Rationale: S phase of interphase duplicates DNA so meiosis can reduce chromosome
number.
6. If a parent cell is heterozygous Aa, what gamete genotypes result from segregation?
A. AA and aa
B. ⭐Correct Answer: B – A and a (each gamete gets either A or a)⭐
C. Aa only
D. AAA and aaa
Rationale: Law of segregation: allele pairs separate into different gametes.
7. How many haploid gametes does one diploid cell produce via meiosis?
A. Two diploid cells
B. Two haploid cells
C. ⭐Correct Answer: C – Four haploid cells⭐
D. One haploid cell
Rationale: Meiosis I + II yield four genetically unique haploid gametes from one diploid
parent.
8. If a parent is heterozygous (Aa), what % of gametes carry A?
A. 100%
B. ⭐Correct Answer: B – 50%⭐
C. 25%
D. 75%
Rationale: Heterozygote produces equal A and a gametes: 1/2 A, 1/2 a.
9. A homozygous cell could have which genotypes? (pick the correct options conceptually)
A. ⭐Correct Answer: A – AA and aa are both possible⭐
B. Aa only
C. A mix only
D. None
Rationale: Homozygous = two identical alleles (AA or aa).
10. If a parent is aa (homozygous recessive), % of gametes with a allele =
A. 50%
B. 25%
C. ⭐Correct Answer: C – 100%⭐
D. 0%
Rationale: Homozygous recessive produces only a-bearing gametes.
11. Which division type produces gametes?
A. Mitosis
WGU BIO C190 UNIT 6 | MULTICHOICE ANSWERED EXAM QUESTIONS
WITH DETAILED RATIONALES | 2026
1. Which structure contains the largest amount of genetic information?
A. Gene
B. Allele
C. Protein
D. ⭐Correct Answer: D – Chromosome⭐
Rationale: A chromosome is a long DNA molecule housing many genes and alleles; genes
and alleles are smaller units on chromosomes.
2. Fur color in dogs is an example of a(n):
A. Genotype
B. Allele
C. ⭐Correct Answer: C – Phenotype⭐
D. Chromosome
Rationale: Phenotype = observable trait (fur color); genotype is genetic makeup causing
the trait.
3. The genes that encode brown pigment in a dog are part of the dog's:
A. Phenotype
B. Allele
C. ⭐Correct Answer: C – Genotype⭐
D. Chromosome number
Rationale: Genotype describes the organism’s specific alleles (genes) that determine
traits.
4. A cell having two different alleles of the same gene is called:
A. Homozygous
B. Haploid
C. ⭐Correct Answer: C – Heterozygous⭐
D. Polyploid
Rationale: Heterozygous = two different alleles (e.g., Aa) at a locus.
5. Prior to meiosis, which event happens during interphase?
A. The cell divides
B. The nucleus breaks down
C. ⭐Correct Answer: C – DNA is copied (S phase)⭐
D. Chromosomes separate
, ESTUDYR
Rationale: S phase of interphase duplicates DNA so meiosis can reduce chromosome
number.
6. If a parent cell is heterozygous Aa, what gamete genotypes result from segregation?
A. AA and aa
B. ⭐Correct Answer: B – A and a (each gamete gets either A or a)⭐
C. Aa only
D. AAA and aaa
Rationale: Law of segregation: allele pairs separate into different gametes.
7. How many haploid gametes does one diploid cell produce via meiosis?
A. Two diploid cells
B. Two haploid cells
C. ⭐Correct Answer: C – Four haploid cells⭐
D. One haploid cell
Rationale: Meiosis I + II yield four genetically unique haploid gametes from one diploid
parent.
8. If a parent is heterozygous (Aa), what % of gametes carry A?
A. 100%
B. ⭐Correct Answer: B – 50%⭐
C. 25%
D. 75%
Rationale: Heterozygote produces equal A and a gametes: 1/2 A, 1/2 a.
9. A homozygous cell could have which genotypes? (pick the correct options conceptually)
A. ⭐Correct Answer: A – AA and aa are both possible⭐
B. Aa only
C. A mix only
D. None
Rationale: Homozygous = two identical alleles (AA or aa).
10. If a parent is aa (homozygous recessive), % of gametes with a allele =
A. 50%
B. 25%
C. ⭐Correct Answer: C – 100%⭐
D. 0%
Rationale: Homozygous recessive produces only a-bearing gametes.
11. Which division type produces gametes?
A. Mitosis
