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Mendelian Genetics Quiz

Instructions

Answer each of the following questions by selecting the most appropriate answer from the choices given. Each question has only one or more correct answers.

  1. What are the three laws of inheritance proposed by Gregor Mendel? A. Law of Segregation
    B. Law of Codominance
    C. Law of Independent Assortment
    D. Law of Dominance
  1. In a monohybrid cross between a homozygous tall plant (TT) and a homozygous short plant (tt), what is the expected genotype of the offspring? A. TT
    B. Tt
    C. tt
    D. Tt and tt
  1. Using the monohybrid cross example (TT x tt), what are the phenotypic ratios of the offspring? A. 3 Tall : 1 Short
    B. 1 Tall : 1 Short
    C. 100% Tall
    D. 100% Short
  1. In a dihybrid cross between two pea plants that are heterozygous for both traits (RrYy), what are the parental genotypes? A. RRYY
    B. RrYy
    C. rrYY
    D. RRYy
  1. What is the phenotypic ratio expected from a dihybrid cross between two heterozygous parents (RrYy x RrYy)? A. 9:3:3:1
    B. 1:2:1
    C. 3:1
    D. 1:1
  1. Given a parental genotype of AaBb, which gametes can be produced? A. AB
    B. Ab
    C. aB
    D. All of the above
  1. What is the expected genotypic ratio from a monohybrid cross (Tt x Tt)? A. 1 TT : 2 Tt : 1 tt
    B. 3 TT : 1 tt
    C. 1 Tt : 1 tt
    D. 1 TT : 1 tt
  1. Which of the following describes codominance? A. When one allele completely masks another
    B. When both alleles are expressed equally in the phenotype
    C. When a new phenotype is formed from the blending of two alleles
    D. When a trait is influenced by multiple genes
  1. Which inheritance pattern is illustrated by red and white flowers producing offspring with red and white flowers? A. Incomplete dominance
    B. Codominance
    C. Complete dominance
    D. Polygenic inheritance
  1. If a homozygous dominant (AA) is crossed with a heterozygous (Aa), what are the possible genotypes of the offspring? A. AA
    B. Aa
    C. aa
    D. AA and Aa
  1. Which term describes the external appearance of an organism? A. Genotype
    B. Phenotype
    C. Allele
    D. Homologous chromosomes
  1. What are alleles? A. Different forms of a gene
    B. Identical chromosomes
    C. The combination of genes
    D. The physical traits of an organism

Answer Key

Here’s the guide for checking your answers:

  1. A, C, D
  2. B
  3. C
  4. B
  5. A
  6. D
  7. A
  8. B
  9. B
  10. D
  11. B
  12. A

Good luck!