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A member asked:
What are some of the genetic situations for a child to be born with down syndrome?
4 doctors weighed in across 2 answers
Down Syndrome: Down syndrome is caused by imperfect division of chromosomes with an extra 21 chromosome ending up in the embryo. How that is manifest in the fetus can vary. There are many structural abnormalities associated with down syndrome. The prognosis for the fetus with Down syndrome is dependent upon what abnormalities are found.
Answered 2/18/2015
5.9k views
Several possible: The features of Down syndrome seem to be dependent on the addition of one extra segment of a 21 chromosome.You can get there several ways. The traditional ds (~95%) has 3 copies of a 21 chromosome. About 4% have the specific extra 21 piece stuck on a regular chromosome.About 1% have a mosaic of some normal and some 21 trisomy in variable amounts.
Answered 2/18/2015
5.9k views
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