pedigree

Viewing 12 reply threads
  • Author
    Posts
    • #278
      jessica
      Participant

      what is a pedigree and how do you read them

    • #18971
      biostudent84
      Participant

      A pedigree is the scientific word for a family tree. If you need help learning how to read it, you should be able to find a tutorial at http://www.geaneology.com

    • #18978
      Inuyasha
      Participant

      I wonder… aren’t pedigrees just for animals besides humans. I have never heard it used when talking about a human family tree.

    • #18982
      biostudent84
      Participant

      No, they are identical. The difference in names is because humans feel uncomfortably referring to their reproduction as “breeding,” and we rarely think of any other organism (pedigrees can be written for more than just animals) as belonging to a “family.”

      Kyle

    • #18986
      ERS
      Participant

      the field of genetic counseling relies heavily upon pedigrees in order to advise families as to their chances of inheritance of certain disorders etc.

      Fascinating field.

    • #18987
      biostudent84
      Participant

      The Amish are known to have some of the most extensive pedigrees known.

      Their culture keeps them from marrying outside the religion, so they do this to minimize the risk of inbreeding.

    • #18989
      Cyranian
      Participant

      People of royal blood too, then? And also “big” families? In some cultures, parents want their offsprings to carry the name and “purity” of their tree.

    • #18992
      biostudent84
      Participant

      Yes, Royal Houses ususally keep documented pedigrees…but none so extensive as the Amish. I was able to see one once…it covered an entire wall, hahaha

    • #19053
      Antje
      Participant

      isn’t that why there were so many birth defects in those families? 😕

    • #19054
      biostudent84
      Participant

      No, it’s how they can keep there gene lines “pure” while limiting those defects as much as possible.

    • #19608
      moosyman123
      Participant

      but how can they limit them? wouldn’t reproducing within a family naturally cause defects?

    • #19696
      RobJim
      Participant

      I’d imagine they’d avoid having people with hemophilia, or who are direct descendents of such people within a few generations, from marrying each other, etc.

    • #81539
      knanyes
      Participant

      pedigree is a chart that shows how a trait is inherited through a family.[/color]
      circles: females
      squares: males
      shaded: individual is affected with the trait
      carrier: an individual that carriers the allele for a trait but does not express the trait.

      steps to completing a pedigree

      1: place two lower case letters by every affected individual
      2: place one upper case letter case next to every normal individual.
      3: use the pedigree to determine the genotypes of the normal individuals.

Viewing 12 reply threads
  • You must be logged in to reply to this topic.