Complete the following statements to describe Down syndrome.
An example of nondisjunction in autosomes is
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, also called Down syndrome.
This results from an extra copy of
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, usually donated from the
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in approximately 80 percent of the cases.
Individuals with Down syndrome tend to have the following similar characteristics: short stature, an extra eyelid fold, stubby fingers, a fissured tongue, and sometimes
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.
The chance of having a child with Down syndrome
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rapidly with maternal age, starting at about the age of 40.