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Pedigrees

Pedigrees. Honors Biology 8.6. Would you want to know…. If your baby were going to get Huntington’s disease?. In order to predict the future…. We must analyze the past! Geneticists analyze family history to predict the future appearance of a trait. Pedigrees.

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Pedigrees

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  1. Pedigrees Honors Biology 8.6

  2. Would you want to know… • If your baby were going to get Huntington’s disease?

  3. In order to predict the future… • We must analyze the past! • Geneticists analyze family history to predict the future appearance of a trait.

  4. Pedigrees • Show relationships within a family • Track traits or disease in a family

  5. Pedigree Symbols

  6. Pedigree Symbols • Marriage or Mating • Siblings

  7. Pedigree Symbols • Roman Numerals represent generations I II III

  8. Example Pedigree

  9. Interpreting a Pedigree Chart • We can determine if a trait is : • Dominant or recessive • Sex-linked or autosomal

  10. Example of Pedigree Charts • Dominant or Recessive?

  11. Example of Pedigree Charts • Dominant or Recessive? Aa Aa aa

  12. Example of Pedigree Charts • Dominant or Recessive?

  13. Aa Aa aa aa Example of Pedigree Charts • Dominant or Recessive?

  14. Example of Pedigree Charts • Dominant or Recessive?

  15. Example of Pedigree Charts • Dominant or Recessive?

  16. Example of Pedigree Charts • Autosomal or sex-linked? • Dominant or recessive?

  17. Example of Pedigree Charts • Autosomal or sex-linked? • Dominant or recessive?

  18. Helpful hints • If both parents have the trait, but one of their offspring do not, then the trait is dominant • If neither parent has the trait, but one of their offspring has it, then the trait is recessive. • If the trait appears every generation, then the trait is probably dominant, but not always • If mostly men have the trait, it is probably sex-linked

  19. Summary • Pedigrees are family trees that explain your genetic history. • Pedigrees are used to find out the probability of a child having a certain trait in a particular family.

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