Quiz  /  Genes and Alleles: Fact or Fiction?

  • 1. 
    A gene is a unit of hereditary information.

  • true
  • false

  • 2. 
    All genes are made up of DNA.

  • true
  • false

  • 3. 
    The few genes that are not made up of DNA are called alleles.

  • true
  • false

  • 4. 
    A given gene may have multiple different alleles.

  • true
  • false

  • 5. 
    Alleles can result in different phenotypes, or observable traits.

  • true
  • false

  • 6. 
    An example of codominant allele expression is flower color in pea plants.

  • false
  • true

  • 7. 
    An example of codominant allele expression is the human ABO blood group system.

  • true
  • false

  • 8. 
    In eukaryotes, genes are contained in a single chromosome that is free-floating in the cell cytoplasm.

  • true
  • false

  • 9. 
    Genes within the cells of organisms are always active.

  • true
  • false

  • 10. 
    The number of genes in an organism’s genome varies significantly between species.

  • true
  • false
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