Pedigree Analysis

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Pedigree Analysis

• Tracking genes through family trees

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Pedigree Symbols
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Practice Problem 1

• Draw a pedigree for a family containing a mother,
  father, three sons, two daughters, and two
  grandchildren by the oldest son.

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Practice Problem 2

• Based on this pedigree tracking albinism in a
  family, what can you tell about the
• Great-grandmother?
• Son on the left who has four kids?
• Daughter on right who has four kids?
• Parents of great-grandson?
• How does this pedigree show how recessive traits
  can skip generations?

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Practice Problem 3

• This pedigree tracks the curled-ear trait through
  four generations of cats. Copy the pedigree and
  describe the genotype of each cat based on its
  reproductive history.
• Does this trait skip generations? Explain.

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• This pedigree tracks the white-eye phenotype in
  fruit flies.
• What can you tell about this trait?