December 30, 2004 at 11:43 pm #278jessicaParticipant
what is a pedigree and how do you read them
January 4, 2005 at 2:39 am #18971
January 4, 2005 at 1:07 pm #18978InuyashaParticipant
I wonder… aren’t pedigrees just for animals besides humans. I have never heard it used when talking about a human family tree.
January 5, 2005 at 1:08 am #18982
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.”
January 5, 2005 at 1:53 am #18986ERSParticipant
the field of genetic counseling relies heavily upon pedigrees in order to advise families as to their chances of inheritance of certain disorders etc.
January 5, 2005 at 1:54 am #18987
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.
January 5, 2005 at 4:30 am #18989CyranianParticipant
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.
January 5, 2005 at 5:05 am #18992
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
January 19, 2005 at 3:43 am #19053AntjeParticipant
isn’t that why there were so many birth defects in those families? 😕
January 19, 2005 at 6:32 am #19054
No, it’s how they can keep there gene lines “pure” while limiting those defects as much as possible.
February 15, 2005 at 1:30 am #19608moosyman123Participant
but how can they limit them? wouldn’t reproducing within a family naturally cause defects?
February 19, 2005 at 4:36 am #19696RobJimParticipant
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.
February 7, 2008 at 2:17 am #81539knanyesParticipant
pedigree is a chart that shows how a trait is inherited through a family.[/color]
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.
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