Down'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.
To return to the previous topic,
click on your browser's 'Back' button.