RE: Down Syndrome and Radiation Exposure

["Karam, Andrew" <Andrew_Karam@URMC.Rochester.edu>]

I believe that Down Syndrome is caused by having three copies of Chromosome
#21.  I do not see how this can be considered an effect of radiation
exposure.  

According to my genetics text, it is caused by "...nondisjunction of
chromosome 21 during meiosis...Following fertilization with a normal gamete,
the trisomic condition is created."

Andy
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