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Pedigrees - PowerPoint PPT Presentation


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Pedigrees. Pedigrees. A pedigree is a diagram of family relationships that uses symbols to represent people and lines to represent genetic relationships. These diagrams make it easier to visualize relationships within families, particularly large extended families.

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pedigrees1
Pedigrees
  • A pedigree is a diagram of family relationships that uses symbols to represent people and lines to represent genetic relationships.
  • These diagrams make it easier to visualize relationships within families, particularly large extended families.
  • Pedigrees are often used to determine the mode of inheritance (dominant, recessive, etc.) of genetic diseases.
pedigrees2
Pedigrees
  • Squares represent Males
  • Circles represent Females
  • Horizontal lines connecting a male and female represent mating
  • Vertical lines extending downward from a couple represent their children
  • Oldest individuals are found at the top and youngest on the bottom
pedigrees3
Pedigrees
  • Completely shaded in individuals posses the trait
  • Half shaded in individuals are carriers of the trait