Genetic Disorders: Penetrance & Phenotypic Variability Video


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What is a syndrome?

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1. A geneticist is studying a rare, autosomal dominant syndrome that is characterized by the following three hallmarks: a significantly increased risk for cancer, exceptional height, and early hearing loss. If the syndrome is 70% penetrant, then what does this mean?

2. Which of the following is NOT an example of phenotypic variability?

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About This Quiz & Worksheet

The quiz will test you on the definitions related to the subject of penetrance and phenotypic variability. Some questions will provide you with scenarios while others will ask you to single out false examples. Still others will ask you to identify the single true statement of the choices provided.

Quiz & Worksheet Goals

The quiz will cover the following definitions:

  • Genetic conditions
  • Syndromes
  • Phenotypic variability

Skills Practiced

The quiz will help you practice the following skills:

  • Reading comprehension - ensure that you draw the most important information from the related penetrance and phenotypic variability lesson
  • Making connections - use understanding of the concept of penetrance and phenotypic variability
  • Interpreting information - verify that you can read information regarding syndromes and interpret it correctly

Additional Learning

After you complete the quiz, make sure to explore the corresponding lesson Genetic Disorders: Penetrance & Phenotypic Variability. The lesson will help you cover the following information:

  • Defining autosomal conditions
  • Describing dominant alleles
  • Clarifying the meaning of phenotypic variability
  • Identifying the definition of expressivity
  • Characterizing penetrance