Exceptions to Simple Dominance: Codominance and Incomplete Dominance


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The following results were observed from a mating between two black and white speckled cats: 5 black cats, 12 black and white speckled cats, and 4 white cats. Which term describes the relationship between the alleles of the coat color gene?

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1. Incomplete dominance governs the pigment gene of a flower. A mating between heterozygotes yields the following phenotypic ratio: 15 red flowers, 32 pink flowers and 14 white flowers. Which statement describes the situation?

2. Which phenotype(s) do the red blood cells from a person with AB blood type exhibit?

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About This Quiz & Worksheet

This quiz and worksheet combo will help you quickly assess the importance of understanding codominance and incomplete dominance. You will be quizzed on phenotypes, heterozygotes and homozygotes.

Quiz & Worksheet Goals

Use this worksheet and quiz to review:

  • Relationship between alleles and genes based on a given example
  • Incomplete dominance and the pigment gene of a flower
  • Red blood cells and phenotypes
  • Situation when heterozygotes demonstrate a phenotype which is intermediate between the homozygotes

Skills Practiced

  • Reading comprehension - ensure that you draw the most important information from the related biology lesson
  • Interpreting information - read information regarding a particular blood type and interpret it correctly
  • Knowledge application - use your knowledge to answer questions about the relationship between alleles and genes

Additional Learning

To learn further, take a look at the lesson called Exceptions to Simple Dominance: Codominance and Incomplete Dominance. This lesson covers the following objectives:

  • Identify the difference between a dominant trait and a recessive trait
  • Learn about blood donors and recipients
  • Identify what phenotypic blending is