Chapter 14: Mendel and the Gene Idea
1. Which of the following describes a genotype?
○ a) Tall plant
○ b) Aa
○ c) Green seeds
○ d) Yellow flowers
2. The law of segregation states that:
○ a) Each allele segregates independently
○ b) Alleles segregate during gamete formation
○ c) Dominant traits are always expressed
○ d) Genes are located on chromosomes
3. In a monohybrid cross, the F2 generation ratio is:
○ a) 3:1
○ b) 1:2:1
○ c) 9:3:3:1
○ d) 1:1:1:1
4. What is the expected phenotypic ratio in a dihybrid cross?
○ a) 9:3:3:1
○ b) 3:1
○ c) 1:1:1:1
○ d) 1:2:1
5. If a pea plant has a genotype of Tt, what does it mean?
○ a) It is homozygous recessive
○ b) It has two dominant alleles
○ c) It has one dominant and one recessive allele
○ d) It is homozygous dominant
6. A testcross is used to:
○ a) Determine the genotype of an individual
○ b) Determine the phenotype of an individual
○ c) Test for genetic disorders
○ d) Create new alleles
7. Mendel’s law of independent assortment applies to:
○ a) Genes located on the same chromosome
○ b) Genes located on different chromosomes
○ c) Genes that do not assort independently
○ d) Genes that are linked
8. A dominant allele:
○ a) Is masked by a recessive allele
○ b) Determines the organism’s appearance if present
○ c) Is always the most common allele
○ d) Must be inherited from both parents
9. Which of the following is an example of codominance?
○ a) Pink flowers from red and white parents
○ b) Blood type AB
○ c) Green peas from yellow and green parents
○ d) Blue eyes from brown-eyed parents
, 10. What is the probability of getting a homozygous recessive offspring from two
heterozygous parents?
○ a) 1/2
○ b) 1/4
○ c) 1/8
○ d) 1/16
11. Incomplete dominance is demonstrated when:
○ a) Both alleles are equally expressed
○ b) One allele is completely dominant over the other
○ c) The heterozygote phenotype is intermediate
○ d) Alleles blend to form a new trait
12. Which type of cross examines the inheritance of a single trait?
○ a) Monohybrid cross
○ b) Dihybrid cross
○ c) Trihybrid cross
○ d) Polygenic cross
13. How many alleles for each gene are present in a gamete?
○ a) One
○ b) Two
○ c) Three
○ d) Four
14. Which of the following is a true statement about alleles?
○ a) Alleles are different forms of the same gene
○ b) Alleles are identical versions of the same gene
○ c) Alleles are only found in recessive traits
○ d) Alleles cannot be inherited
15. A dihybrid cross involves organisms that are heterozygous for how many traits?
○ a) One
○ b) Two
○ c) Three
○ d) Four
16. What is a phenotype?
○ a) The genetic makeup of an organism
○ b) The physical appearance of a trait
○ c) A type of genetic disorder
○ d) A type of gene mutation
17. Which process is used to determine the probability of traits in the offspring?
○ a) Punnett square
○ b) Gene mapping
○ c) DNA sequencing
○ d) Cloning
18. How are dominant and recessive alleles represented in Mendelian genetics?
○ a) Dominant alleles with uppercase letters, recessive alleles with lowercase
letters
○ b) Both alleles with uppercase letters
○ c) Both alleles with lowercase letters
○ d) Dominant alleles with symbols, recessive alleles with numbers
19. What is the principle of dominance?
1. Which of the following describes a genotype?
○ a) Tall plant
○ b) Aa
○ c) Green seeds
○ d) Yellow flowers
2. The law of segregation states that:
○ a) Each allele segregates independently
○ b) Alleles segregate during gamete formation
○ c) Dominant traits are always expressed
○ d) Genes are located on chromosomes
3. In a monohybrid cross, the F2 generation ratio is:
○ a) 3:1
○ b) 1:2:1
○ c) 9:3:3:1
○ d) 1:1:1:1
4. What is the expected phenotypic ratio in a dihybrid cross?
○ a) 9:3:3:1
○ b) 3:1
○ c) 1:1:1:1
○ d) 1:2:1
5. If a pea plant has a genotype of Tt, what does it mean?
○ a) It is homozygous recessive
○ b) It has two dominant alleles
○ c) It has one dominant and one recessive allele
○ d) It is homozygous dominant
6. A testcross is used to:
○ a) Determine the genotype of an individual
○ b) Determine the phenotype of an individual
○ c) Test for genetic disorders
○ d) Create new alleles
7. Mendel’s law of independent assortment applies to:
○ a) Genes located on the same chromosome
○ b) Genes located on different chromosomes
○ c) Genes that do not assort independently
○ d) Genes that are linked
8. A dominant allele:
○ a) Is masked by a recessive allele
○ b) Determines the organism’s appearance if present
○ c) Is always the most common allele
○ d) Must be inherited from both parents
9. Which of the following is an example of codominance?
○ a) Pink flowers from red and white parents
○ b) Blood type AB
○ c) Green peas from yellow and green parents
○ d) Blue eyes from brown-eyed parents
, 10. What is the probability of getting a homozygous recessive offspring from two
heterozygous parents?
○ a) 1/2
○ b) 1/4
○ c) 1/8
○ d) 1/16
11. Incomplete dominance is demonstrated when:
○ a) Both alleles are equally expressed
○ b) One allele is completely dominant over the other
○ c) The heterozygote phenotype is intermediate
○ d) Alleles blend to form a new trait
12. Which type of cross examines the inheritance of a single trait?
○ a) Monohybrid cross
○ b) Dihybrid cross
○ c) Trihybrid cross
○ d) Polygenic cross
13. How many alleles for each gene are present in a gamete?
○ a) One
○ b) Two
○ c) Three
○ d) Four
14. Which of the following is a true statement about alleles?
○ a) Alleles are different forms of the same gene
○ b) Alleles are identical versions of the same gene
○ c) Alleles are only found in recessive traits
○ d) Alleles cannot be inherited
15. A dihybrid cross involves organisms that are heterozygous for how many traits?
○ a) One
○ b) Two
○ c) Three
○ d) Four
16. What is a phenotype?
○ a) The genetic makeup of an organism
○ b) The physical appearance of a trait
○ c) A type of genetic disorder
○ d) A type of gene mutation
17. Which process is used to determine the probability of traits in the offspring?
○ a) Punnett square
○ b) Gene mapping
○ c) DNA sequencing
○ d) Cloning
18. How are dominant and recessive alleles represented in Mendelian genetics?
○ a) Dominant alleles with uppercase letters, recessive alleles with lowercase
letters
○ b) Both alleles with uppercase letters
○ c) Both alleles with lowercase letters
○ d) Dominant alleles with symbols, recessive alleles with numbers
19. What is the principle of dominance?
