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From what is known about the causes of Down syndrome, environmental factors and parents' behavioral activity do not seem to play a role. The causes of Down syndrome are genetic problems related to chromosome 21. While Down syndrome is genetic in that it involves an extra chromosome 21, it is not usually hereditary in the conventional sense.
A century after Down syndrome was first described, scientists discovered that the root cause of this disorder is a condition called trisomy 21. century after Down syndrome was first described, scientists discovered that the root cause of this disorder is a condition called trisomy 21.