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Understanding Pedigree Charts: Inheritance of Traits in Families

A pedigree chart is a visual representation that illustrates how traits are inherited through generations of a family. It uses specific symbols: circles represent females, squares represent males, shaded shapes indicate individuals affected by a trait, and half-shaded shapes represent carriers. To read a pedigree, locate individuals using Roman numerals for generations and numbers for individuals within those generations. Horizontal lines signify marriages, while vertical lines connect parents to their offspring. Understanding these elements allows for effective interpretation of genetic inheritance.

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Understanding Pedigree Charts: Inheritance of Traits in Families

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Presentation Transcript

  1. I. What is a pedigree? A chart that shows how a trait is inherited through a family

  2. II. About Pedigrees · Circles - ____Females______ · Squares - _____Males____ ·Shaded - individual is affected with the trait. • Carrier - an individual that carries the allele for a trait but does not express the trait. (half-shaded)

  3. How to read individuals in a pedigree:

  4. Find individual II-4.

  5. The roman numerals show generations… the numbers show the individuals within that generation

  6. Horizontal and Vertical Lines Horizontal Lines mean marriage

  7. Horizontal and Vertical Lines Vertical Lines mean offspring (children)

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