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Pedigree Charts

Pedigree Charts. The family tree of genetics. Overview. What is a pedigree? Definition Uses Constructing a pedigree Symbols Connecting the symbols Interpreting a pedigree. What is a Pedigree?. A pedigree is a chart of the genetic history of family over several generations.

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Pedigree Charts

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  1. Pedigree Charts The family tree of genetics

  2. Overview • What is a pedigree? • Definition • Uses • Constructing a pedigree • Symbols • Connecting the symbols • Interpreting a pedigree

  3. What is a Pedigree? • A pedigree is a chart of the genetic history of family over several generations. • Scientists or a genetic counselor would find out about your family history and make this chart to analyze.

  4. Constructing a Pedigree • Male • Female

  5. Connecting Pedigree Symbols • Fraternal twins • Identical twins Examples of connected symbols:

  6. Connecting Pedigree Symbols • Married Couple • Siblings Examples of connected symbols:

  7. Example • What does a pedigree chart look like?

  8. Normal Affected Sex-linked carrier Autosomal carrier Symbols in a Pedigree Chart

  9. Interpreting a Pedigree Chart • Determine if the pedigree chart shows an autosomal or Sex-linked disease. • If most of the males in the pedigree are affected the disorder is Sex-linked • If it is a 50/50 ratio between men and women the disorder is autosomal.

  10. Example of Pedigree Charts • Is it Autosomal or Sex-linked?

  11. Answer • Autosomal

  12. Interpreting a Pedigree Chart • Determine whether the disorder is dominant or recessive. • If the disorder is dominant, one of the parents must have the disorder. • If the disorder is recessive, neither parent has to have the disorder because they can be heterozygous.

  13. Example of Pedigree Charts • Dominant or Recessive?

  14. Answer • Dominant

  15. Example of Pedigree Charts • Dominant or Recessive?

  16. Answer • Recessive

  17. Summary • Pedigrees are family trees that explain your genetic history. • Pedigrees are used to find out the probability of a child having a disorder in a particular family. • To begin to interpret a pedigree, determine if the disease or condition is autosomal or Sex-linked and dominant or recessive.

  18. Your Assignment • You are going to create a pedigree using a trait that is found in some of the members of your family. • Identify if the trait is dominant or recessive using the information you get from surveying your family members • In order to get enough information, your pedigree must be at least 3 generations!

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