Pedigree Chart Reading

6 Questions

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Pedigree Chart Reading

Please do your best to answer the following questions about pedigree charts and what they can tell you.


Questions and Answers
  • 1. 
    How many affected individuals are on this pedigree chart and how can you tell?
    • A. 

      6, those who are shaded black

    • B. 

      3, those who are shaded black with a slash

    • C. 

      11, those who have a slash

    • D. 

      12, those who are not shaded

  • 2. 
    Is this chart following a dominant or recessive trait and how do you know?
    • A. 

      Dominant, because it shows up only in males

    • B. 

      Dominant, because most of the people affected have died

    • C. 

      Recessive, because it does / did not show up in every generation

    • D. 

      X linked recessive, because it does not show up in every generation and no / very few females are affected

  • 3. 
    If this chart is following the recessive trait for albinism (people who are albinos, aa), then what is the genotype of the parents at the top of the chart?
    • A. 

      Aa and Aa

    • B. 

      Aa and aa

    • C. 

      Aa and Aa

    • D. 

      AA and AA

  • 4. 
    How many members of this family are deceased?
    • A. 

      11

    • B. 

      6

    • C. 

      9

    • D. 

      4

  • 5. 
    The parents that begin this chart are the first generation. How many of their children were albinos?
    • A. 

      2

    • B. 

      6

    • C. 

      4

  • 6. 
    In the third generation, what is the genotype of the only child of the third mating from the left ?
    • A. 

      Aa

    • B. 

      AA

    • C. 

      A?

    • D. 

      Aa