Regardless of the type of Down syndrome a person may have, all people considering Down syndrome have an auxiliary, necessary allocation of chromosome 21 high flier in all or some of their cells. This supplementary genetic material alters the course of restructure and causes the characteristics similar once Down syndrome.

The cause of the subsidiary full or partial chromosome is yet unsigned. Maternal age is the lonely factor that has been associated to an increased unintended of having a baby following Down syndrome resulting from nondisjunction or mosaicism. However, due to highly developed birth rates in younger women, 80% of children once Down syndrome are born to women numb 35 years of age.

There is no definitive scientific research that indicates that Down syndrome is caused by environmental factors or the parents actions back or during pregnancy.

The subsidiary partial or full copy of the 21st chromosome which causes Down syndrome can originate from either the dad or the mother. Approximately 5% of the cases have been traced to the dad.

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