|previous term||next term|
Down syndrome is usually caused by an error in cell division called non-disjunction. There are also two other types of chromosomal abnormalities (mosaicism and translocation) that to a lesser extent are also implicated as possible causes of Down syndrome. Regardless of the type of Down syndrome which a person may have, all people with Down syndrome have an extra, critical portion of the number 21 chromosome present in all or some of their cells. The presence of this additional genetic material alters the normal course of development, which results in the development of the characteristics that are normally associated with the syndrome.
Find more information on Down Syndrome
NOTICE: By using the adoption glossary you agree to our terms of service
Corrections, additions, other terms? Send us your feedback.
To see local Adoption resources, please select a location (U.S. only):
Note: Our authors are dedicated to honest, engaged, informed, intelligent, and open conversation about adoption. The opinions expressed here may not reflect the views of Adoption.com.