Down SyndromeDown's syndrome is condition with several symptoms, including a
characteristic body type, mental retardation, increased susceptibility to
infections, and various heart and other organ abnormalities. It is a result of
an extra copy of chromosome 21. In most cases this is a result of one of the
parents' gametes not dividing properly. In some cases, it is a result of one of
the parents having a chromosomal abnormality in which chromosome 14 and 21 are
merged. This can be detected by looking at the parents' chromosomes.
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by: CTNS
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